2D plot of a matrix using colors
Matplot1(a,rect)
:a real matrix of size (n1,n2). : :rect [xmin,ymin,xmax,ymax] :
The entries of matrix int(a) are used as colormap entries in the current colormap. rect specify a rectangle in the current scale and the matrix is drawn inside this rectangle. Each matrix entry will be rendered as a small rectangle filled with its associated color. If a matrix entry is outside the colormap, the corresponding rectangle is not displayed.
//--- first example
`clf`_();
ax=`gca`_();//get current axes handle
ax.data_bounds=[0,0;10,10];//set the data_bounds
ax.box='on'; //draw a box
a=5*`ones`_(11,11); a(2:10,2:10)=4; a(5:7,5:7)=2;
// first matrix in rectangle [1,1,3,3]
Matplot1(a,[1,1,3,3])
a=`ones`_(10,10); a= 3*`tril`_(a)+ 2*a;
// second matrix in rectangle [5,6,7,8]
Matplot1(a,[5,6,7,8])
//--- second example (animation)
n=100;
`clf`_();
f=`gcf`_();//get current figure handle
f.pixmap='on';//double buffer mode
ax=`gca`_();//get current axes handle
ax.data_bounds=[0,0;10,10];//set the data_bounds
ax.box='on'; //draw a box
`show_pixmap`_()
for k=-n:n,
a=`ones`_(n,n);
a= 3*`tril`_(a,k)+ 2*a;
a= a + a';
k1= 3*(k+100)/200;
if k>-n then `delete`_(`gce`_()),end
Matplot1(a,[k1,2,k1+7,9])
`show_pixmap`_() //send double buffer to screen
`sleep`_(8); // Slow down the simulation
end
f.pixmap='off';