matrix-trick.m

% Say you have a matrix and you want to quickly understand what the 
% data distribution looks like.
% The following snippet will do the trick.

A = magic(5) % create a random matrix

imagesc(A), colorbar, colormap grey;

% This will create a greyscale image of the values of the matrix, with
% each number corresponding to a different value of grey. It will also
% give you a key to which you may refer.