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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA
// Copyright (C) Bruno Pincon
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
function []=Sgrayplot(x,y,z, strf, rect, nax, zminmax, colminmax, mesh, colout)
//
// PURPOSE
// Like grayplot but the function fec is used to smooth the
// result assuming that the underlying function is linear on
// a set of triangles built from the grid (here with n1=5, n2=3):
// _____________
// | /| /| /| /|
// |/_|/_|/_|/_|
// | /| /| /| /|
// |/_|/_|/_|/_|
//
// Copyright INRIA
// Modified by Bruno Pincon (14 oct 04) to have named argument working
// Some new modifs (Bruno Pincon, Feb 2005, demo + some checking + cleaning + add
// mesh and colout optionnal args)
[lhs,rhs] = argn();
if rhs == 0 then // demo
t=-%pi:0.1:%pi;
m=sin(t)'*cos(t)
f=gcf();
f.color_map = jetcolormap(64);
f.immediate_drawing = "off";
colorbar(-1,1);
Sgrayplot(t,t,m,strf="041",zminmax=[-1,1]);
xtitle("Sgrayplot demo f(x,y)=sin(x)*cos(y) on [-pi,pi]x[-pi,pi]");
f.immediate_drawing = "on";
return
elseif rhs < 3 then
error("bad number of input arguments")
end
// some checks
if ~(type(x)==1 & isreal(x) & type(y)==1 & isreal(y) & type(z)==1 & isreal(z)) then
error("three first arguments must be real")
end
nx = length(x); ny = length(y); [p,q] = size(z)
if p ~= nx | q ~= ny then
error("third argument has incompatible dimensions with the two first")
end
// parsing the optionnal args
opt_arg_list = ["strf", "rect","nax","zminmax", "colminmax", "mesh", "colout"]
opt_arg_seq = []
for opt_arg = opt_arg_list
if exists(opt_arg,"local") then
opt_arg_seq = opt_arg_seq +","+ opt_arg + "=" + opt_arg
end
end
// build the datas for fec
[noe_x,noe_y] = ndgrid(x,y)
nbtri = 2*(p-1)*(q-1)
num = (1:p*(q-1))'; num(p*(1:q-1)) = []; num1 = num+1
connect =[(1:nbtri)' , [num num1 num+p;...
num1 num1+p num+p] , zeros(nbtri,1)]
// then plot
if opt_arg_seq == [] then
fec(noe_x,noe_y,connect,z)
else
execstr("fec(noe_x,noe_y,connect,z"+opt_arg_seq+")")
end
endfunction
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