<87eigde28n....@gmail.com>
<87d3vw8shu.wl%ucec...@ucl.ac.uk>
<87631o8ebj....@gmail.com>
<87wru4uhux.wl%ucec...@ucl.ac.uk>
<aanlktikoyclhdvuisb11vymrceivo9hx3n3rdrsow...@mail.gmail.com>
User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/23.2 Mule/6.0
(HANACHIRUSATO)
Hello,
While I'm at it, I'd like to suggest asymptote as a neat tool to draw
all those graphs.
Here are two examples illustrating it (admittedly not so well for the
surface, but I explain why in my comments) :
#+begin_src asymptote
import graph3;
size(7cm,0);
currentprojection=orthographic(-4,-2,3);
// define function f(z), where z ( z.x , z.y )
real f(pair z) { return sin(z.x) + sin(z.y); }
// Drawing meshes (pen for surface is nullpen)
draw(surface(f,(-4,-4),(4,4),nx=30),nullpen,meshpen=red,nolight);
// Dumb axis but my asymptote version is too old for something
// more complex
xaxis3();
yaxis3();
zaxis3();
#+end_src
#+begin_src asymptote :file graph-asy-polar.pdf
import graph;
size(7cm,0);
// defining function and its graph
real f(real t) {return sqrt(2)/2-cos(3t);}
path Cf=polargraph(f,0,2pi,n=1440,operator ..)--cycle;
// drawing graph
draw(Cf,.8bp+red);
// axis and units
xaxis("$x$");
yaxis("$y$");
draw((0,0)--(1,0),.8bp+blue,Arrow());
draw((0,0)--(0,1),.8bp+blue,Arrow());
#+end_src
--
Nicolas
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