Visualizing values in a matrix

Hi there,

I wrote a script that runs loops on a 100x100 matrix and changes values within. That matrix only contains ZEROS and ONES and I would like to visualize the development of the ONES for each iteration.

From what I gathered, I 'pcolor' is the way to go but I am not at all sure how to implement that.

Lets say it is only a 10x10 matrix, like so:

0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 1 0 0 0

0 0 0 0 0 0 0 0 0 0

0 0 0 1 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0

1 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 1 0 0

0 0 0 0 0 0 0 0 0 0

I would like to turn this into something like this:

The numbers for row and column are not needed and neither is the outer border...

I am sure it turns out to be a simple one-liner ... So, if anyone of you know how, please help.

Your help is much appreciated!!!

Answer 1

[KSSV]

Read about spy

clc; clear all ;
m = 10 ; 
A = zeros(m);
% introduce random ones 
id = randperm(m*m,20) ; 
A(id) = 1 ;  
[m,n] = size(A) ; 
[Y,X] = meshgrid(1:m,1:n) ; 
idx = find(A) ; 
plot(X(idx),Y(idx),'s','edgecolor','r')

You can use scatter to plot squares with colors.

[antifreund]

This is just perfect!!!! Thanks a million!