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mode(-1);
// Copyright INRIA
xbasc()
mode(1)
ncolor=228;
// First plot
xsetech([0.,0.,0.5,0.5],[-1,1,-1,1]);
h=hotcolormap(ncolor);
xset('colormap',h);
grayplot()
// Second plot
xsetech([0.5,0.,0.5,0.5],[-1,1,-1,1]);
h1=((1:ncolor)'/ncolor)*[1 0 0];
xset('colormap',h1);
plot3d1()
// Third plot
xsetech([0.,0.5,0.5,0.5],[-1,1,-1,1]);
h2=graycolormap(ncolor);
xset('colormap',h2);
grayplot()
// Fourth plot
xsetech([0.5,0.5,0.5,0.5],[-1,1,-1,1]);
deff('[x,y,z]=knot(u,v)',['vv=ones(v)';'uu=ones(u);';
'x=(5.*cos(u)+cos(u).*cos(v))';
'y=(5.*sin(u)+sin(u).*cos(v))';
'z=(uu.*sin(v))';])
nx=60;Nx=(0:nx)/nx ;ny=20;Ny=(0:ny)/ny;
[xx,yy,zz]=eval3dp(knot,2*%pi*Nx,2*%pi*Ny);
XXX=[-xx xx];YYY=[-yy zz];ZZZ=[-zz yy];
kk1=[1:size(zz,2)];
ncolor=60;
hh=hotcolormap(ncolor);
xset('colormap',hh) ;
kk1=modulo(kk1,60);kk2=kk1;
KKK=list(ZZZ,[kk1 kk2]);
plot3d(XXX,YYY,KKK,35,70," @ @ ",[2,1,4],[-6,6,-6,6,-6,6]);
// Change the window colormap
xpause(2.d6)
xset('colormap',h);
xbasr(xget('window'))
xpause(2d6)
xset('colormap',h1);
xbasr(xget('window'))
xpause(2d6)
xset('colormap',h2);
xbasr(xget('window'))
xpause(2d6)
xset('colormap',hh) ;
xbasr(xget('window'))
xset('default');
xsetech([0 0 1 1])
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