Representing a Matrix Graphically (but not exactly)

Hello All, I'm new here. I tried looking for this topic, but couldn't find anything.

What I want to do is to represent a matrix graphically. That means that I want the values of each cell in the matrix to appear on a graph on the X,Y coordinates of the cell. For instance, if I have the next matrix:

5 2 1

0 2 3

9 3 7

So the 5 in the first row will be at (1,1), 2 at (1,2), 1 at (1,3), etc. The values can be replaced by '*' or any other symbol really.

Thanks, eliya

Answer 1

[Walter Roberson]

Or if you want a representation that is color coded but contains no symbols

imagesc(ArrayName)

Answer 2

[Paulo Silva]

a=[5 2 1
0 2 3
9 3 7]
axis([0 size(a,2) 0 size(a,1)])
for b=1:numel(a)
[x,y]=ind2sub(size(a),b)
text(x,y,num2str(a(b)))
end

Answer 3

[Matt Fig]

Like this (a surface?):

Z = [5 2 1
0 2 3
9 3 7];
surf(Z.')
xlabel('X')
ylabel('Y')

Answer 4

[Matt Tearle]

z = [5 2 1 <etc> 
[m,n] = size(z);  
[x,y] = meshgrid(1:n,1:m);
plot3(x(:),y(:),z(:),'o')

or

text(x(:),y(:),num2str(z(:)))

Or even just

image(z), colorbar

BTW, typically you'd think of the columns as the x coordinate, so 2 would actually be at x=2, y=1. If that's not what you want, just flip the role of x and y.

[Walter Roberson]

Or instead of plot3, use scatter3

scatter3(x(:),y(:),z(:))

Answer 5

[Eliya]

Thanks everyone. It all worked, but Walter's suggestion to use imagesc was the best as I'm writing a "Game of Life" kind of program. Thanks again for the prompt replies!