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-- This file:
-- http://anggtwu.net/LUA/Piecewise2.lua.html
-- http://anggtwu.net/LUA/Piecewise2.lua
-- (find-angg "LUA/Piecewise2.lua")
-- Author: Eduardo Ochs <eduardoochs@gmail.com>
--
-- Piecewise functions, version for Pict3.lua.
-- Supersedes:
-- (find-angg "LUA/Piecewise1.lua")
--
-- (defun e () (interactive) (find-angg "LUA/Piecewise2.lua"))
-- (defun o () (interactive) (find-angg "LUA/Piecewise1.lua"))
-- (defun pw2 () (interactive) (find-angg "LUA/Piecewise2.lua"))
-- (defun pw1 () (interactive) (find-angg "LUA/Piecewise1.lua"))
-- (defun p2 () (interactive) (find-angg "LUA/Pict2e2.lua"))
-- (defun p3 () (interactive) (find-angg "LUA/Pict3.lua"))
-- (defun i2 () (interactive) (find-angg "LUA/Indent2.lua"))
-- (defun ps1 () (interactive) (find-angg "LUA/PictShow1.lua"))
require "Indent2" -- (find-angg "LUA/Indent2.lua")
-- (find-angg "LUA/Indent2.lua" "Pict")
require "MiniV1" -- (find-angg "LUA/MiniV1.lua" "MiniV-tests")
require "Pict3" -- (find-angg "LUA/Pict3.lua")
-- «.PwSpec» (to "PwSpec")
-- «.PwSpec-test1» (to "PwSpec-test1")
-- «.PwSpec-test2» (to "PwSpec-test2")
-- «.PwSpec-testmtint» (to "PwSpec-testmtint")
-- «.PwFunction» (to "PwFunction")
-- «.PwFunction-Riemann» (to "PwFunction-Riemann")
-- «.PwFunction-tests» (to "PwFunction-tests")
-- «.PwFunction-testpoles» (to "PwFunction-testpoles")
-- «.PwFunction-intfig» (to "PwFunction-intfig")
-- «.Partition» (to "Partition")
-- «.Partition-tests» (to "Partition-tests")
-- «.Riemann» (to "Riemann")
-- «.Riemann-tests» (to "Riemann-tests")
-- «.Riemann-tests-sc» (to "Riemann-tests-sc")
-- «.TFC1» (to "TFC1")
-- «.TFC1-tests» (to "TFC1-tests")
-- «.Xtoxytoy» (to "Xtoxytoy")
-- «.Xtoxytoy-test1» (to "Xtoxytoy-test1")
-- «.Xtoxytoy-test2» (to "Xtoxytoy-test2")
-- «.Xtoxytoy-test3» (to "Xtoxytoy-test3")
-- «.ChangeVar» (to "ChangeVar")
-- «.ChangeVar-test1» (to "ChangeVar-test1")
-- ____ ____
-- | _ \__ __/ ___| _ __ ___ ___
-- | |_) \ \ /\ / /\___ \| '_ \ / _ \/ __|
-- | __/ \ V V / ___) | |_) | __/ (__
-- |_| \_/\_/ |____/| .__/ \___|\___|
-- |_|
--
-- «PwSpec» (to ".PwSpec")
-- A "spec" for a piecewise function is something like this:
--
-- "(0,1)c--(2,3)o (2,2)c (2,1)o--(4,1)--(5,2)"
--
-- Note that its segments can be non-horizontal.
--
-- An object of this class starts with a spec, immediately calculates
-- its lists of "dxyoc"s, and from that it can generate lots of other
-- data. The list of "dxyoc"s for the spec above is:
--
-- PwSpec.from("(0,1)c--(2,3)o (2,2)c (2,1)o--(4,1)--(5,2)").dxyocs
-- = { {"dash"="" , "x"=0, "y"=1, "oc"="c"},
-- {"dash"="-", "x"=2, "y"=3, "oc"="o"},
-- {"dash"="" , "x"=2, "y"=2, "oc"="c"},
-- {"dash"="" , "x"=2, "y"=1, "oc"="o"},
-- {"dash"="-", "x"=4, "y"=1, "oc"="" },
-- {"dash"="-", "x"=5, "y"=2, "oc"="" } }
--
PwSpec = Class {
type = "PwSpec",
from = function (src)
return PwSpec({src=src, dxyocs={}}):add(src)
end,
fromep = function (spec0) -- ep means "eval, topict"
local exprang = function (str) return expr(str:sub(2,-2)) end
local spec = spec0:gsub("%b<>", exprang)
local pws = PwSpec.from(spec)
local p = pws:topict()
if color then p = p:Color(color) end
return p
end,
dxyoc_to_string = function (dxyoc)
return format("%s(%s,%s)%s",
(dxyoc.dash == "-" and "--" or " "),
dxyoc.x, dxyoc.y, dxyoc.oc or "")
end,
__tostring = function (pws) return pws:tostring() end,
__index = {
npoints = function (pw) return #pw.points end,
--
-- Add points and segments.
-- Example: pws:add("(0,1)o--(1,1)o (1,2)c (1,3)o--(2,3)c--(3,2)--(4,2)c")
add = function (pws, str)
local patn = "%s*([-+.%d]+)%s*"
local pat = "(%-?)%("..patn..","..patn.."%)([oc]?)"
for dash,x,y,oc,_ in str:gmatch(pat) do
table.insert(pws.dxyocs, {dash=dash, x=x+0, y=y+0, oc=oc})
end
return pws
end,
--
tostring = function (pws)
return mapconcat(PwSpec.dxyoc_to_string, pws.dxyocs, "")
end,
--
-- Express a piecewise function as a Lua function.
conds_tbl = function (pws)
local conds = {}
for i=1,#pws.dxyocs do
local P0,P1,P2 = pws.dxyocs[i], pws.dxyocs[i+1], pws.dxyocs[i+2]
local p0,p1,p2 = P0, P1 or {}, P2 or {}
local x0,y0,oc0 = p0.x, p0.y, p0.oc
local x1,y1,oc1,dash1 = p1.x, p1.y, p1.oc, p1.dash
local x2,y2,oc2,dash2 = p2.x, p2.y, p2.oc, p2.dash
if oc0 ~= "o" then
local cond = format("(%s == x) and %s", x0, y0)
table.insert(conds, cond)
end
if dash1 == "-" then
local cond = format("(%s < x and x < %s)", x0, x1)
if y1 == y0 then
cond = format("%s and %s", cond, y0)
else
cond = format("%s and (%s + (x - %s)/(%s - %s) * (%s - %s))",
cond, y0, x0, x1, x0, y1, y0 )
end
table.insert(conds, cond)
end
end
return conds
end,
conds = function (pws) return table.concat(pws:conds_tbl(), " or\n") end,
fun0 = function (pws) return "function (x) return (\n"..pws:conds().."\n) end" end,
fun = function (pws) return expr(pws:fun0()) end,
--
-- Get lines and open/closed points, for drawing.
getj = function (pws, i)
return (pws.dxyocs[i+1]
and (pws.dxyocs[i+1].dash == "-")
and pws:getj(i+1)) or i
end,
getijs = function (pws)
local i, j, ijs = 1, pws:getj(1), {}
while true do
if i < j then table.insert(ijs, {i, j}) end
i = j + 1
j = pws:getj(i)
if #pws.dxyocs < i then return ijs end
end
end,
getpoint = function (pws, i) return v(pws.dxyocs[i].x, pws.dxyocs[i].y) end,
getpoints = function (pws, i, j)
local ps = Points2.new()
for k=i,j do ps:add(pws:getpoint(k)) end
return ps
end,
topict = function (pws)
cmds = Pict {}
for _,ij in ipairs(pws:getijs()) do
cmds:add(pws:getpoints(ij[1], ij[2]):Line())
end
for i,p in ipairs(pws.dxyocs) do
if p.oc == "o" then
cmds:addopendotat(pws:getpoint(i))
elseif p.oc == "c" then
cmds:addcloseddotat(pws:getpoint(i))
end
end
return cmds
end,
--
topwfunction = function (pws)
local spec,f = pws.src, pws:fun()
local pwf = PwFunction.from(f)
for x,y in spec:gmatch("%( *([-.0-9]+) *, *([-.0-9]+) *%)") do
pwf:addpoint(tonumber(x))
end
return pwf
end,
},
}
-- «PwSpec-test1» (to ".PwSpec-test1")
--[==[
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
spec = "(0,1)c--(2,3)o (2,2)c (2,1)o--(4,1)--(5,2)"
PPPV(PwSpec.from(spec).dxyocs)
spec = "(0,1)o--(1,1)o (1,4)c (1,3)o--(2,3)c--(3,2)--(4,2)c"
spec = "(0,1)c--(2,3)o (2,2)c (2,1)o--(4,1)c"
pws = PwSpec.from(spec)
= pws
= pws:conds()
= pws:fun0()
= pws:topict()
= pws:topict():predotdims ("0.4", "0.2")
= pws:topict():predotdims1("0.4 0.2")
= pws:topict():show("pgat")
= pws:topict():show("pgat", {dotdims="0.4 0.2"})
= pws:topict():show("pgat", {dotdims="0.2 0.1"})
* (etv)
f = pws:fun()
= f(0.1)
= f(1.9)
= f(2)
= f(2.1)
= f(2.2)
--]==]
-- «PwSpec-test2» (to ".PwSpec-test2")
--[[
-- (c2m242srp 26 "fig-with-inftys")
-- (c2m242sra "fig-with-inftys")
-- (c2m212isp 11 "uma-figura")
-- (c2m212isa "uma-figura")
-- (c2m221isp 2 "uma-figura")
-- (c2m221isa "uma-figura")
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
fromep = PwSpec.fromep
thick = function (th) return "\\linethickness{"..th.."}" end
putcellat = function (xy, str) return pformat("\\put%s{\\cell{%s}}", xy, str) end
= fromep("(0,0)--(2,<1+2>)c")
= putcellat(v(2,3), "foo")
_minfy,_pinfy = -3,10
_xD,_xL,_xU = -0.4,-0.8,-1.0
p = Pict {
fromep(" (0,<_pinfy-1>)--(0,<_pinfy>)c "),
fromep(" (0,<_minfy+1>)--(0,<_minfy>)c "),
putcellat(v(1.2, _pinfy), "+\\infty"),
putcellat(v(1.2, _minfy), "-\\infty"),
thick("1pt"),
fromep(" (-1,2)--(3,6)--(8,1)--(11,4) "),
thick("2pt"),
fromep(" (1,0)c--(2,0)o "):color("red"),
fromep(" (1,4)c--(2,5)o "):color("orange"),
fromep(" (0,4)c--(0,5)o "):color("green"),
fromep(" (<_xL>,<_minfy>)c--(<_xL>,4)c "):color("blue"),
fromep(" (<_xD>,4)c--(<_xD>,5)o "):color("SpringDarkHard"),
fromep(" (<_xU>,5)c--(<_xU>,<_pinfy>)c "):color("violet"),
}
= p:pgat("gat")
= p:setbounds(v(-1,0), v(11,7))
= p:pgat("p")
= p:scalebox("0.4")
q = (p
:setbounds(v(-1,0), v(11,7))
:pgat("gat")
:setbounds(v(-1,_minfy), v(11,_pinfy))
:pgat("p")
)
= q
= q:show0("", {ul="12pt", scale="0.8"})
= q:show ("", {ul="12pt", scale="0.8"})
= Show.log
* (etv)
--]]
-- «PwSpec-testmtint» (to ".PwSpec-testmtint")
-- (c2m221mt1p 2 "defs-figuras")
-- (c2m221mt1a "defs-figuras")
--[==[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
hx = function (x, y) return format(" (%s,%s)c--(%s,%s)o", x-1,y, x,y) end
hxs = function (...)
local str = ""
for x,y in ipairs({...}) do str = str .. hx(x, y) end
return str
end
mtintegralspec = function (specf, xmax, y0)
local pws = PwSpec.from(specf)
local f = pws:fun()
local ys = {[0] = y0}
for x=1,xmax do ys[x] = ys[x - 1] + f(x - 0.5) end
local strx = function (x) return tostring(v(x, ys[x])) end
local specF = mapconcat(strx, seq(0, xmax), "--")
return specF
end
= hxs(1, 2, -1)
specf = "(0,1)--(1,1)c (1,2)o--(3,2)o (3,-1)c--(4,-1)"
specF = mtintegralspec(specf, 4, -2)
pwsf = PwSpec.from(specf)
pwsF = PwSpec.from(specF)
pf = pwsf:topict():setbounds(v(0,-2), v(4,3)):pgat("pgat")
pF = pwsF:topict():setbounds(v(0,-2), v(4,3)):pgat("pgat")
p = Pict { pf, "\\quad", pF }
= p:show("")
* (etv)
--]==]
-- ____ _____ _ _
-- | _ \__ _| ___| _ _ __ ___| |_(_) ___ _ __
-- | |_) \ \ /\ / / |_ | | | | '_ \ / __| __| |/ _ \| '_ \
-- | __/ \ V V /| _|| |_| | | | | (__| |_| | (_) | | | |
-- |_| \_/\_/ |_| \__,_|_| |_|\___|\__|_|\___/|_| |_|
--
-- «PwFunction» (to ".PwFunction")
-- An object of the class PwFunction starts with a function and with
-- its sets of "important points", and it can produce lots of data
-- from that.
--
-- The most typical use of "PwFunction" is like this:
--
-- f = function (x) if x < 2 then return x^2 else return 2 end end
-- pwf = PwFunction.from(f, seq(0, 2, 0.5), 4)
-- pict = pwf:pw(1, 3)
-- pict:bshow()
--
-- We convert the function f (plus its important points) to a
-- PwFunction, and then we generate a PwSpec that draws its graph in a
-- certain interval, and we convert that PwSpec to a Pict2e object and
-- we draw it. Note that the method ":pw(...)" does two conversions:
--
-- PwFunction -> PwSpec -> Pict2e
--
PwFunction = Class {
type = "PwFunction",
from = function (f, ...)
return PwFunction({f=f}):setpoints(...)
end,
__index = {
--
-- The "important points" are stored in a "Set".
-- Example: pwf:setpoints(seq(0, 4, 0.25), 5, 6, 7)
setpoints = function (pwf, ...)
pwf.points = Set.new() -- (find-angg "LUA/lua50init.lua" "Set")
return pwf:addpoints(...)
end,
addpoints = function (pwf, ...)
for _,o in ipairs({...}) do
if type(o) == "number" then pwf:addpoint(o)
elseif type(o) == "table" then pwf:addlistofpoints(o)
else PP("not a point or a list of points:", o); error()
end
end
return pwf
end,
addpoint = function (pwf, p)
if type(p) ~= "number" then PP("Not a number:", p); error() end
pwf.points:add(p)
return pwf
end,
addlistofpoints = function (pwf, A)
for _,p in ipairs(A) do pwf:addpoint(p) end
return pwf
end,
--
-- All important points in the interval (a,b).
pointsin = function (pwf, a, b)
local A = {}
for _,x in ipairs(pwf.points:ks()) do
if a < x and x < b then table.insert(A, x) end
end
return A
end,
--
-- Detect discontinuities using a heuristic.
eps = 1/32768,
delta = 1/128,
hasjump = function (pwf, x0, x1)
local y0,y1 = pwf.f(x0), pwf.f(x1)
return math.abs(y1-y0) > pwf.delta
end,
hasjumpl = function (pwf, x) return pwf:hasjump(x - pwf.eps, x) end,
hasjumpr = function (pwf, x) return pwf:hasjump(x, x + pwf.eps) end,
--
xy = function (pwf, x, y) return pformat("(%s,%s)", x, y or pwf.f(x)) end,
xyl = function (pwf, xc) return pwf:xy(xc - pwf.eps) end,
xyr = function (pwf, xc) return pwf:xy(xc + pwf.eps) end,
jumps_and_xys = function (pwf, xc)
local xyl, xyc, xyr = pwf:xyl(xc), pwf:xy(xc), pwf:xyr(xc)
local jumpl = pwf:hasjumpl(xc) and "l" or ""
local jumpr = pwf:hasjumpr(xc) and "r" or ""
local jumps = jumpl..jumpr -- "lr", "l", "r", or ""
return jumps, xyl, xyc, xyr
end,
--
xym = function (pwf, xc)
local jumps, xyl, xyc, xyr = pwf:jumps_and_xys(xc)
if jumps == "" then str = xyc
elseif jumps == "l" then str = format("%so %sc", xyl, xyc)
elseif jumps == "r" then str = format( "%sc %so", xyc, xyr)
elseif jumps == "lr" then str = format("%so %sc %so", xyl, xyc, xyr)
end
return str
end,
--
piecewise_m = function (pwi, xc) -- "m" is for "middle"
local jumps, xyl, xyc, xyr = pwi:jumps_and_xys(xc)
if jumps == "" then str = xyc
elseif jumps == "l" then str = format("%so %sc", xyl, xyc)
elseif jumps == "r" then str = format("%sc %so", xyc, xyr)
elseif jumps == "lr" then str = format("%so %sc %so", xyl, xyc, xyr)
end
return str
end,
piecewise = function (pwi, a, b, method, sep)
local method, sep = method or "piecewise_m", sep or "--"
local f = function (x) return pwi[method](pwi, x) end
local str = pwi:xyr(a)
-- for _,x in ipairs(pwi.points:ks()) do
-- if a < x and x < b then
-- str = str..sep..f(x)
-- end
-- end
for _,x in ipairs(pwi:pointsin(a, b)) do
str = str..sep..f(x)
end
str = str..sep..pwi:xyl(b)
return str
end,
pw = function (pwi, a, b)
return pictpiecewise(pwi:piecewise(a, b))
end,
--
-- pwf:pwspec(a, b) converts a pwf to a "piecewise spec".
-- This is tricky, so let's see an example. Suppose that:
--
-- pwf:pointsin(a, b) = {c}.
--
-- Then in the simplest case pwf:piecewise(a, b) would generate a
-- piecewise spec like this,
--
-- "(a,f(a))--(c,f(c))--(b,f(b))"
--
-- but we have tricks for dealing with discontinuites and drawing
-- closed dots and open dots... for example, we can generate
-- something like this:
--
-- "(a,f(a))--(c-eps,f(c-eps))o (c,f(c))c--(b,f(b))"
--
-- The hard work to convert c to
--
-- "(c-eps,f(c-eps))o (c,f(c))c"
--
-- is done by the function xym, defined above; the case "_o _c"
-- corresponds to jumps == "l". Note that the "eps"s usually
-- disappear when each coordinate of the "(x,y)"s is rounded to at
-- most three decimals.
--
-- Btw, I think that the extremities are "(a+eps,f(a+eps))" and
-- "(b-eps,f(b+eps))", not "(a,f(a))" and "(b,f(b))"... TODO:
-- check that.
--
-- Btw 2: pwf:pwspec(...) can generate other kinds of output if
-- it is called with the right hackish optional arguments.
--
pwspec = function (pwf, a, b, method, sep)
local method = method or "xym"
local sep = sep or "--"
local xym = function (x) return pwf[method](pwf, x) end
local str
--
-- Add points (including discontinuities) and "--"s to str.
str = pwf:xyr(a)
for _,x in ipairs(pwf:pointsin(a, b)) do str = str..sep..xym(x) end
str = str..sep..pwf:xyl(b)
return str
end,
--
-- :pw(a,b) generates a Pict2e object that
-- draws f in the interval [a,b].
pw = function (pwf, a, b)
return PwSpec.from(pwf:pwspec(a, b)):topict()
end,
--
--
--
-- Methods that call pwspec in hackish ways.
-- TODO: fix names, write tests.
--
-- :lineify(...) and :areaify(...) only work when
-- there are no discontinuities. FIX THIS!
--
lineify00 = function (pwf, a, b) -- new, 2022jun16
local ps = Points2.new()
local addp = function (x) ps:add(v(x, pwf.f(x))) end
local hasjump = function (xl, xr) return pwf:hasjump(xl, xr) end
local e = pwf.eps
if hasjump(a, a+e) then addp(a+e) else addp(a) end
for _,x in ipairs(pwf:pointsin(a, b)) do
if hasjump(x-e, x+e) then addp(x-e); addp(x+e) else addp(x) end
end
if hasjump(b-e, b) then addp(b-e) else addp(b) end
return ps
end,
lineify0 = function (pwf, a, b) return pwf:piecewise(a, b, nil, "") end,
lineify = function (pwf, a, b)
return Pict { pformat("\\Line%s", pwf:lineify00(a, b)) }
end,
areaify = function (pwf, a, b)
local ly = pwf:lineify0(a, b)
local poly = pformat("%s%s%s", v(a,0), pwf:lineify00(a, b), v(b,0))
return Pict { "\\polygon*"..poly }
end,
},
}
-- «PwFunction-tests» (to ".PwFunction-tests")
--[[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
f = function (x) if x < 2 then return x^2 else return 2 end end
pwf = PwFunction.from(f, seq(0, 2, 0.5), 4)
PPPV(pwf)
spec = pwf:pwspec(0, 4)
PPPV(spec)
spec = pwf:pwspec(1, 3)
PPPV(spec)
pws = PwSpec.from(spec)
PPPV(pws)
pict = pws:topict()
PPPV(pict)
= pict
f = function (x) if x < 2 then return x^2 else return 2 end end
pwf = PwFunction.from(f, seq(0, 2, 0.5), 4)
= pwf:lineify00(1.1, 3.1)
= pwf:lineify(1.1, 3.1)
= pwf:areaify(1.1, 3.1)
= pwf:pwspec(0, 4)
= pwf:pw (0, 4)
= pwf:pwspec(1, 3)
= pwf:pw (1, 3)
= pwf:pw (1, 3):show()
* (etv)
= pwf:pw (0, 4):show()
* (etv)
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
PictBounds.setbounds(v(0,0), v(8,5))
f_parabola_preferida = function (x)
return 4 - (x-2)^2
end
f_parabola_complicada = function (x)
if x <= 4 then return f_parabola_preferida(x) end
if x < 5 then return 5 - x end
if x < 6 then return 7 - x end
if x < 7 then return 3 end
if x == 7 then return 4 end
return 0.5
end
pwf = PwFunction.from(f_parabola_complicada, seqn(0, 4, 32), seq(4, 8))
p = Pict {
pwf:areaify(2, 6.5):Color("Orange"),
pwf:pw(0, 8),
}
= p:show()
* (etv)
--]]
-- (find-LATEX "2021-1-C2-critical-points.lua" "Approxer")
-- (c2m212somas2p 42 "exercicio-16-defs")
-- (c2m212somas2a "exercicio-16-defs")
-- «PwFunction-testpoles» (to ".PwFunction-testpoles")
-- New: (c2m221atisp 5 "x^-2")
-- (c2m221atisa "x^-2")
-- Old: (c2m212intsp 5 "x^-2")
-- (c2m212intsa "x^-2")
-- (find-es "maxima" "TFC2-fails")
--[[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
PictBounds.setbounds(v(-4,-4), v(4,4))
plotdot = function (x, y) return Pict{}:addcloseddotat(v(x,y)) end
trunc = function (y) return min(max(-4,y),4) end
f = function (x) return x==0 and 4 or trunc(1/x^2) end
F = function (x) return x==0 and 4 or trunc(-1/x) end
pwf = PwFunction.from(f, seqn(-4, 4, 64))
pwF = PwFunction.from(F, seqn(-4, 4, 64))
= f(2)
= F(2)
p = Pict {
pwf:areaify(-1, 1):Color("Orange"),
pwf:pw(-4, -1/2),
pwf:pw(1/2, 4),
}
= p:show()
* (etv)
p = Pict {
pwF:pw(-4, -1/4),
pwF:pw(1/4, 4),
plotdot(-1, F(-1)),
plotdot(1, F(1))
}
= p:show()
* (etv)
--]]
-- «PwFunction-intfig» (to ".PwFunction-intfig")
-- Superseded by: (to "ChangeVar-test1")
--[[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
PictBounds.setbounds(v(0,0), v(4,3))
pi, sqrt, sin, cos = math.pi, math.sqrt, math.sin, math.cos
maxu = pi
maxx = sqrt(maxu)
fu = function (u) return math.sin(u) end
fx = function (x) return math.sin(x^2) * 2*x end
pwfu = PwFunction.from(fu, seqn(0, maxu, 64))
pwfx = PwFunction.from(fx, seqn(0, maxx, 64))
areau = function (a, b, color)
return pwfu:areaify(a, b):color(color)
end
areax = function (a, b, color)
return pwfx:areaify(sqrt(a), sqrt(b)):color(color)
end
areauorx = function(areaf)
local p = Pict {}
local colors = split("red orange yellow")
local points = {0, 1, 2, 3}
for i=1,#colors do table.insert(p, areaf(points[i], points[i+1], colors[i])) end
return p
end
pu = Pict {
areauorx(areau),
pwfu:lineify(0, maxu),
}
px = Pict {
areauorx(areax),
pwfx:lineify(0, maxx),
}
pux = Pict {
pu:pgat("pgatc"),
"\\quad",
px:pgat("pgatc"),
}
= pux:show("")
= pux
* (etv)
}
--]]
-- ____ _ _ _ _
-- | _ \ __ _ _ __| |_(_) |_(_) ___ _ __
-- | |_) / _` | '__| __| | __| |/ _ \| '_ \
-- | __/ (_| | | | |_| | |_| | (_) | | | |
-- |_| \__,_|_| \__|_|\__|_|\___/|_| |_|
--
-- «Partition» (to ".Partition")
Partition = Class {
type = "Partition",
new = function (a, b) return Partition {points={a,b}} end,
__tostring = mytostringp,
__index = {
a = function (ptn) return ptn.points[1] end,
b = function (ptn) return ptn.points[#ptn.points] end,
N = function (ptn) return #ptn.points - 1 end,
ai = function (ptn, i) return ptn.points[i] end,
bi = function (ptn, i) return ptn.points[i+1] end,
bminusa = function (ptn) return ptn:b() - ptn:a() end,
splitn = function (ptn, N)
local points = {}
local Delta = ptn:bminusa()
for k=0,N do table.insert(points, ptn:a() + Delta*(k/N)) end
return Partition {points=points}
end,
},
}
-- «Partition-tests» (to ".Partition-tests")
--[[
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
= Partition.new(2, 10)
= Partition.new(2, 10):splitn(4)
= Partition.new(2, 10):splitn(4):N()
ptn = Partition.new(2, 10):splitn(4)
for i=1,ptn:N() do
print(i, ptn:ai(i), ptn:bi(i))
end
-- Use this do draw semicircles
ptn = Partition { points={} }
for _,theta in ipairs(seqn(math.pi, 0, 8)) do
print(theta, math.cos(theta))
table.insert(ptn.points, math.cos(theta))
end
= ptn
--]]
-- ____ _
-- | _ \(_) ___ _ __ ___ __ _ _ __ _ __
-- | |_) | |/ _ \ '_ ` _ \ / _` | '_ \| '_ \
-- | _ <| | __/ | | | | | (_| | | | | | | |
-- |_| \_\_|\___|_| |_| |_|\__,_|_| |_|_| |_|
--
-- «Riemann» (to ".Riemann")
Riemann = Class {
type = "Riemann",
fromspec = function (spec)
local pws = PwSpec.from(spec)
local f = pws:fun()
local pwf = PwFunction.from(f)
for x,y in spec:gmatch("%( *([-.0-9]+) *, *([-.0-9]+) *%)") do
pwf:addpoint(tonumber(x))
end
return Riemann { spec=spec, f=f, pws=pws, pwf=pwf }
end,
frompwf = function (pwf)
return Riemann { pwf=pwf, f=pwf.f }
end,
fromf = function (f, ...)
local pwf = PwFunction.from(f, ...)
return Riemann.frompwf(pwf)
end,
__tostring = mytostringvp,
__index = {
piecewise_pol1 = function (rie, xc) -- for polygons
local jumps, xyl, xyc, xyr = rie.pwf:jumps_and_xys(xc)
if jumps == ""
then return xyc
else return format("%s%s", xyl, xyr)
end
end,
piecewise_pol = function (rie, a, b)
local a0, b0 = rie.pwf:xy(a, 0), rie.pwf:xy(b, 0)
return a0..pwi:piecewise(a, b, "piecewise_pol1", "")..b0
end,
pol = function (rie, a, b, star)
-- return "\\polygon"..(star or "")..pwi:piecewise_pol(a, b)
return Pict { "\\polygon"..(star or "")..rie.pwf:piecewise_pol(a, b) }
end,
--
inforsup = function (rie, maxormin, a, b)
local y = rie.f(a)
local consider = function (x) y = maxormin(y, rie.f(x)) end
consider(a + rie.pwf.eps)
for _,x in ipairs(rie.pwf:pointsin(a, b)) do
consider(x - rie.pwf.eps)
consider(x)
consider(x + rie.pwf.eps)
end
consider(b - rie.pwf.eps)
consider(b)
return y
end,
inf = function (rie, a, b) return rie:inforsup(min, a, b) end,
sup = function (rie, a, b) return rie:inforsup(max, a, b) end,
max = function (rie, a, b) return max(rie.f(a), rie.f(b)) end,
min = function (rie, a, b) return min(rie.f(a), rie.f(b)) end,
zero = function (rie) return 0 end,
method = function (rie, mname, a, b) return rie[mname](rie, a, b) end,
rct = function (rie, mname1, mname2, a, b)
local y1 = rie:method(mname1, a, b)
local y2 = rie:method(mname2 or "zero", a, b)
return pformat("(%s,%s)(%s,%s)(%s,%s)(%s,%s)", a,y1, a,y2, b,y2, b,y1)
end,
rects = function (rie, ptn, mname1, mname2, star)
local p = Pict {}
for i=1,ptn:N() do
local ai,bi = ptn:ai(i), ptn:bi(i)
local rct = rie:rct(mname1, mname2, ai, bi)
table.insert(p, format("\\polygon%s%s", star or "*", rct))
end
return p
end,
--
setab = function (rie, a, b) rie.a = a; rie.b = b; return rie end,
ptn = function (rie, N) return Partition.new(rie.a, rie.b):splitn(N) end,
lineify = function (rie, a, b) return rie.pwf:lineify(a, b) end,
areaify = function (rie) return rie.pwf:areaify(rie.a, rie.b) end,
area = function (rie) return rie.pwf:areaify(rie.a, rie.b) end,
areams = function (rie, N, mname1, mname2)
return rie:rects(rie:ptn(N), mname1, mname2, "*")
end,
areainf = function (rie, N) return rie:areams(N, "zero", "inf") end,
areasup = function (rie, N) return rie:areams(N, "zero", "sup") end,
areainfsup = function (rie, N) return rie:areams(N, "inf", "sup") end,
},
}
-- «Riemann-tests» (to ".Riemann-tests")
--[[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
f = function (x) if x < 2 then return x^2 else return 2 end end
rie = Riemann.fromf(f, seq(0, 4, 0.125))
= rie
= rie.pwf
= rie.pwf:pw(1,4)
= rie.pwf:pw(1,4):show()
* (etv)
ptn = Partition.new(1, 4):splitn(4)
curve = rie.pwf:pw(1,4)
rects = rie:rects(ptn, "inf", "sup", "*"):Color("Orange")
p = Pict {
rects,
curve,
}
= p:show()
* (etv)
rie = Riemann.fromspec("(1,2)c--(3,4)--(5,2)c")
ptn = Partition.new(2, 5):splitn(4)
curve = rie.pwf:pw(1, 5)
curve = rie.pws:topict()
rects = rie:rects(ptn, "inf", "sup", "*"):Color("Orange")
p = Pict {
rects,
curve,
}
= p:show()
* (etv)
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
PictBounds.setbounds(v(0,0), v(8,5))
rie = Riemann.fromspec("(0,3)--(2,5)--(6,1)--(8,3)"):setab(1, 7)
p = Pict {
rie:areasup(3):color("yellow"),
rie:areasup(12):color("blue"),
rie:area (3):Color("Orange"),
rie:areainf(3):Color("Red"),
rie:lineify(0, 8),
}
= p
= p:show()
* (etv)
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
PictBounds.setbounds(v(0,0), v(11,7))
rie = Riemann.fromspec("(0,3)--(3,6)--(8,1)--(11,4)"):setab(2, 10)
ColorUpperA = "red!20!white"
ColorUpperB = "Gold1!20!white"
ColorUpperC = "Green1!20!white"
ColorUpperD = "Blue1!20!white"
ColorLowerA = "red!80!white"
ColorLowerB = "Gold1!80!white"
ColorLowerC = "Green1!80!white"
ColorLowerD = "Blue1!80!white"
ColorRealInt = "Purple0!90!white"
UpperA = rie:areasup( 2):color(ColorUpperA)
UpperB = rie:areasup( 4):color(ColorUpperB)
UpperC = rie:areasup( 8):color(ColorUpperC)
UpperD = rie:areasup(16):color(ColorUpperD)
LowerD = rie:areainf(16):color(ColorLowerD)
LowerC = rie:areainf( 8):color(ColorLowerC)
LowerB = rie:areainf( 4):color(ColorLowerB)
LowerA = rie:areainf( 2):color(ColorLowerA)
RealInt = rie:area ():color(ColorRealInt)
p = Pict {
UpperA,
UpperB,
UpperC,
UpperD,
RealInt,
LowerD,
LowerC,
LowerB,
LowerA,
rie:lineify(0, 11),
}
= p
= p:show()
* (etv)
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
para = function (x) return 4*x - x^2 end
vex = function (str) return Code.ve("x => "..str) end
rievex = function (str) return Riemann.fromf(vex(str), seq(0, 4, 0.125)) end
rievexa = function (str, a, b)
local rie = rievex(str)
return Pict {
rie.pwf:areaify(a, b):Color("Orange"),
rie:lineify(0, 4),
}
end
= vex("para(x)")(2)
= vex("para(x)/2")(2)
p = rievexa("para(x)/2", 3, 4)
= p:show()
* (etv)
--]]
-- «Riemann-tests-sc» (to ".Riemann-tests-sc")
--[[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
-- Semicircle:
scxs = {}
for _,theta in ipairs(seqn(math.pi, 0, 32)) do
table.insert(scxs, math.cos(theta))
end
f = function (x) return math.sqrt(1 - x^2) end
rie = Riemann.fromf(f, scxs)
ptn = Partition.new(-1, 1):splitn(8)
curve = rie.pwf:pw(-1, 1)
rects = rie:rects(ptn, "inf", "sup", "*"):Color("Orange")
p = Pict {
rects,
curve,
}
= p:show()
* (etv)
p2 = p:setbounds(v(-2,0), v(2,2)):pgat("pgat"):preunitlength("40pt")
= p2:show("")
* (etv)
--]]
-- _____ _____ ____ _
-- |_ _| ___/ ___/ |
-- | | | |_ | | | |
-- | | | _|| |___| |
-- |_| |_| \____|_|
--
-- «TFC1» (to ".TFC1")
TFC1 = Class {
type = "TFC1",
frompwf = function (pwf) return TFC1 {pwf=pwf, f=pwf.f} end,
fromf = function (f, ...) return TFC1.frompwf(PwFunction.from(f, ...)) end,
fromspec = function (spec)
local pws = PwSpec.from(spec)
local pwf = pws:topwfunction()
return TFC1 {pws=pws, pwf=pwf, f=pwf.f}
end,
__index = {
setxts = function (tfc1, x0, x1, x3, t1, scale)
tfc1.x0 = x0
tfc1.x1 = x1
tfc1.x3 = x3
tfc1.t1 = t1
tfc1.scale = scale
return tfc1
end,
ttox = function (tfc1, t2) return (t2 - tfc1.t1)/tfc1.scale + tfc1.x1 end,
xtot = function (tfc1, x2) return (x2 - tfc1.x1)*tfc1.scale + tfc1.t1 end,
setpwg = function (tfc1)
local g = function (t2)
return tfc1.f(tfc1:ttox(t2))
end
local pwg = PwFunction.from(g)
for x in tfc1.pwf.points:gen() do pwg:addpoint(tfc1:xtot(x)) end
tfc1.g = g
tfc1.pwg = pwg
return tfc1
end,
areaify_f = function (tfc1) return tfc1.pwf:areaify(tfc1.x1, tfc1.x1 + 1/tfc1.scale) end,
areaify_g = function (tfc1) return tfc1.pwg:areaify(tfc1.t1, tfc1.t1 + 1 ) end,
lineify_f = function (tfc1) return tfc1.pwf:lineify(tfc1.x0, tfc1.x3) end,
lineify_g = function (tfc1) return tfc1.pwg:lineify(tfc1.t1, tfc1.t1 + 1) end,
--
areaify_f = function (tfc1) -- corrected version
local a,b = tfc1.x1, tfc1.x1 + 1/tfc1.scale
return tfc1.pwf:areaify(min(a, b), max(a, b))
end,
},
}
-- «TFC1-tests» (to ".TFC1-tests")
-- (c2m212tfc1p 5 "exemplo-1")
-- (c2m212tfc1a "exemplo-1")
--[[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
f = function (x) if x < 2 then return x^2 else return 2 end end
f = function (x) return 4*x - x^2 end
tfc1 = TFC1.fromf(f, 0.9, 1, 1.1, 1.2)
tfc1:setxts(0,1,4, 5, 2)
tfc1:setxts(0,1,4, 5, 2):setpwg()
PPPV(tfc1)
= tfc1.pwf.points
= tfc1.pwf.points:ksc()
= tfc1.f(0.9)
= tfc1.g(4.8)
PictBounds.setbounds(v(0,0), v(7,5))
= tfc1.pwf:areaify(0, 4)
f = function (x) return 4*x - x^2 end
tfc1 = TFC1.fromf(f, seqn(0, 4, 16))
scale = 2
scale = 4
tfc1:setxts(0,1,4, 5, scale):setpwg()
PPPV(tfc1.pwf)
PPPV(tfc1.pwg)
p = Pict {
tfc1:areaify_f():Color("Orange"),
tfc1:areaify_g():Color("Orange"),
tfc1:lineify_f(),
tfc1:lineify_g(),
}
= p
= p:show()
* (etv)
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
PictBounds.setbounds(v(0,0), v(8,5))
spec = "(0,2)--(1,1)--(2,3)--(3,4)--(4,3)"
spec = "(0,2)--(1,0)--(2,1)o (2,2)c (2,3)o--(3,4)--(4,3)"
tfc1 = TFC1.fromspec(spec)
tfc1:setxts(0,2,4, 5, 1/2)
tfc1:setxts(0,2,4, 5, -1/2)
p = Pict {
tfc1:areaify_f():Color("Orange"),
tfc1.pws:topict(),
}
= p
= p:show()
* (etv)
--]]
-- __ ___ _
-- \ \/ / |_ _____ ___ _| |_ ___ _ _
-- \ /| __/ _ \ \/ / | | | __/ _ \| | | |
-- / \| || (_) > <| |_| | || (_) | |_| |
-- /_/\_\\__\___/_/\_\\__, |\__\___/ \__, |
-- |___/ |___/
--
-- «Xtoxytoy» (to ".Xtoxytoy")
-- Draw figures of the form (x,0)c--(x,y)c--(0,y)c,
-- where y=f(x).
--
Xtoxytoy = Class {
type = "Xtoxytoy",
from = function (f, xs)
local vlines = Pict {}
local hlines = Pict {}
local xdots = Pict {}
local xydots = Pict {}
local ydots = Pict {}
for _,x in ipairs(xs) do
local y = f(x)
vlines:addline(v(x,0), v(x,y))
hlines:addline(v(x,y), v(0,y))
xdots :addcloseddotat(v(x,0))
xydots:addcloseddotat(v(x,y))
ydots :addcloseddotat(v(0,y))
end
return Xtoxytoy {vlines=vlines, hlines=hlines,
xdots=xdots, xydots=xydots, ydots=ydots}
end,
__index = {
topict = function (xt, options)
local p = Pict {}
if options:match("v") then p:add(xt.vlines) end
if options:match("h") then p:add(xt.hlines) end
if options:match("x") then p:add(xt.xdots) end
if options:match("p") then p:add(xt.xydots) end
if options:match("y") then p:add(xt.ydots) end
return p
end,
},
}
-- «Xtoxytoy-test1» (to ".Xtoxytoy-test1")
--[[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
PictBounds.setbounds(v(0,0), v(8,6))
spec = "(0,1)--(5,6)--(7,4)"
pws = PwSpec.from(spec)
= pws:topict()
f = pws:fun()
xtos = Xtoxytoy.from(f, {1, 2})
= xtos:topict("hvxpy")
= xtos:topict("v")
p = Pict { pws:topict(), xtos:topict("v") }
= p
= p:show("pgat")
* (etv)
--]]
-- «Xtoxytoy-test2» (to ".Xtoxytoy-test2")
--[[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
PictBounds.setbounds(v(0,0), v(23,9))
spec = "(0,1)--(5,6)--(7,4)--(11,8)--(15,4)--(17,6)--(23,0)"
xs = { 1,3, 6, 9, 11, 13, 16,19, 21 }
labely = -1
pws = PwSpec.from(spec)
xtos = Xtoxytoy.from(pws:fun(), xs)
vlines = xtos:topict("v")
curve = pws:topict()
labels = Pict {}
for i,x in ipairs(xs) do
labels:putstrat(v(x,labely), "\\cell{x_"..(i-1).."}")
end
p = Pict { vlines, curve:prethickness("2pt"), labels }
= p
= p:show("pA", {ul="10pt"})
* (etv)
--]]
-- «Xtoxytoy-test3» (to ".Xtoxytoy-test3")
-- (find-LATEX "2022-1-C2-somas-3.tex" "imagens-figuras")
--[==[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
PictBounds.setbounds(v(0,0), v(8,4))
cthick = "2pt" -- curve
dthick = "0.25pt" -- dots
sthick = "4pt" -- segments
-- Curve:
cspec = "(0,2)--(2,4)--(6,0)--(8,2)"
cpws = PwSpec.from(cspec)
curve = cpws:topict():prethickness(cthick)
p = Pict { curve }
= p:show(nil, {ul="20pt"})
* (etv)
-- Dots:
dotsn = function (nsubsegs)
local xs = seqn(1, 4, nsubsegs)
local dots0 = Xtoxytoy.from(cpws:fun(), xs)
local dots = dots0:topict("vhxpy"):prethickness(dthick):Color("Red")
return dots
end
= dotsn(6)
= dotsn(12)
p = Pict { curve, dotsn(6) }
p = Pict { curve, dotsn(12) }
= p:show(nil, {ul="20pt"})
* (etv)
-- Segments:
sspec = "(1,0)c--(2,0)--(4,0)c" ..
" (1,3)c--(2,4)--(4,2)c" ..
" (0,2)c--(0,4)c"
spws = PwSpec.from(sspec)
segs = spws:topict():prethickness(sthick):Color("Orange")
p = Pict { curve, segs }
= p:show(nil, {ul="20pt"})
* (etv)
--]==]
-- ____ _ __ __
-- / ___| |__ __ _ _ __ __ _ __\ \ / /_ _ _ __
-- | | | '_ \ / _` | '_ \ / _` |/ _ \ \ / / _` | '__|
-- | |___| | | | (_| | | | | (_| | __/\ V / (_| | |
-- \____|_| |_|\__,_|_| |_|\__, |\___| \_/ \__,_|_|
-- |___/
--
-- Draw figures to explain changes of variables.
-- (c2m221atisp 12 "substituicao-figura")
-- (c2m221atisa "substituicao-figura")
-- «ChangeVar» (to ".ChangeVar")
ChangeVar = Class {
type = "ChangeVar",
__index = {
setxs = function (cv, xmin, xmax, xs)
local xtou = function (x) return cv:xtou(x) end
local umin,umax = xtou(xmin), xtou(xmax)
local us = map(xtou, xs)
cv.xmin, cv.xmax, cv.xs = xmin, xmax, xs
cv.umin, cv.umax, cv.us = umin, umax, us
return cv
end,
setus = function (cv, umin, umax, us)
local utox = function (u) return cv:utox(u) end
local xmin,xmax = utox(umin), utox(umax)
local xs = map(utox, us)
cv.xmin, cv.xmax, cv.xs = xmin, xmax, xs
cv.umin, cv.umax, cv.us = umin, umax, us
return cv
end,
setpwfs = function (cv, n)
local fx = function (x) return cv:fx(x) end
local fu = function (u) return cv:fu(u) end
local xs = seqn(cv.xmin, cv.xmax, n or 64)
local us = seqn(cv.umin, cv.umax, n or 64)
local pwfx = PwFunction.from(fx, xs)
local pwfu = PwFunction.from(fu, us)
cv.pwfx = pwfx
cv.pwfu = pwfu
return cv
end,
setcolors = function (cv, colors)
cv.colors = split(colors or "red orange yellow")
return cv
end,
--
curvex = function (cv) return cv.pwfx:lineify(cv.xmin, cv.xmax) end,
curveu = function (cv) return cv.pwfu:lineify(cv.umin, cv.umax) end,
areax = function (cv, x0, x1) return cv.pwfx:areaify(x0, x1) end,
areau = function (cv, u0, u1) return cv.pwfu:areaify(u0, u1) end,
color = function (cv, i) return cv.colors[i] end,
subareax = function (cv, i) return cv:areax(cv.xs[i], cv.xs[i+1]):color(cv:color(i)) end,
subareau = function (cv, i) return cv:areau(cv.us[i], cv.us[i+1]):color(cv:color(i)) end,
areasx = function (cv)
local p = Pict {}
for i=1,#cv.colors do table.insert(p, cv:subareax(i)) end
return p
end,
areasu = function (cv)
local p = Pict {}
for i=1,#cv.colors do table.insert(p, cv:subareau(i)) end
return p
end,
--
labelat = function (cv, xy, str) return pformat("\\put%s{\\cell{%s}}", xy, str) end,
xlabels = function (cv, y)
local p = Pict {}
for i=1,#cv.xs do
table.insert(p, cv:labelat(v(cv.xs[i], y), "x_{"..(i-1).."}"))
end
return p
end,
ulabels = function (cv, y)
local p = Pict {}
for i=1,#cv.us do
table.insert(p, cv:labelat(v(cv.us[i], y), "u_{"..(i-1).."}"))
end
return p
end,
--
rect = function (cv, a, b, y)
return Pict({}):addregion0(v(a,0), v(a,y), v(b,y), v(b,0))
end,
},
}
-- «ChangeVar-test1» (to ".ChangeVar-test1")
-- Supersedes: (to "PwFunction-intfig")
-- See: (c2m232ipp 9 "mv-figura")
-- (c2m232ipa "mv-figura")
--[==[
* (show2-use "$SHOW2LATEXDIR/")
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
dofile "Piecewise2.lua"
usepackages.edrx21 = true
pi, sqrt, sin, cos = math.pi, math.sqrt, math.sin, math.cos
xtou = function (x) return x^2 end
ve = Code.ve
cv = ChangeVar {
xtou = ve " cv,x => x^2 ",
fx = ve " cv,x => sin(x^2) * 2*x ",
fu = ve " cv,u => sin( u ) ",
utox = ve " cv,u => sqrt(u) ",
}
cv:setus(0, pi, {0, 1, 2, 3})
PPPV(cv)
cv:setpwfs()
cv:setcolors()
PPPV(cv)
= cv:subareax(1)
= cv:areasx()
= cv:curvex()
= cv:xlabels(-0.5)
= cv:rect(1, 1.5, 0.5):color("blue")
= cv:rect(cv.xs[2], cv.xs[3], cv:fx(cv.xs[2])):color("blue")
Pict2e.bounds = PictBounds.new(v(0,0), v(4,3))
ppx = Pict {
cv:areasx(),
cv:curvex(),
cv:rect(cv.xs[2], cv.xs[3], cv:fx(cv.xs[2])):color("blue"),
cv:xlabels(-0.35),
}
ppu = Pict {
cv:areasu(),
cv:curveu(),
cv:ulabels(-0.35)
}
pp2 = Pict {
ppx:pgat("pgatc"),
"\\qquad",
ppu:pgat("pgatc"),
}
= ppu:show(nil, {ul="50pt", scale="0.7"})
= pp2:show("", {ul="50pt", scale="0.7"})
* (etv)
--]==]
-- Local Variables:
-- coding: utf-8-unix
-- End: