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Aide Scilab >> Bibliothèque graphique > 2d_plot > Matplot1

# Matplot1

2D plot of a matrix using colors

### Calling Sequence

`Matplot1(a,rect)`

### Arguments

a

real matrix of size (n1,n2).

rect

`[xmin,ymin,xmax,ymax]`

### Description

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.

### Examples

```//--- 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
end```

### Authors

J.Ph.C.

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