i'm new to matlab and I got some problems trying to make it work :

I did everything carefully in the installation method a but then when I try to run edgesDemo.m I got this error :

Error using imPadMex
Requested 137438953888x1726576853504x7598263500303858035 (17179869184.0GB) array exceeds 
maximum array size preference. Creation of arrays greater than 
this limit may take a long time and cause MATLAB to become unresponsive.
See array size limit or preference panel for more information.

and several others but they come from the first one I think

Error in imPad (line 39)
J = imPadMex( I, pad, type );

Error in edgesDetect (line 52)
  I = imPad(I,p,'symmetric');

Error in edgesDemo (line 25)
tic, E=edgesDetect(I,model); toc

As I said i'm quite new to matlab and didn't find yet where this imPadMex error does come from, any help would be greatly appreciated.