|   | 1 |  initial version  | 
The syntax was unexpectedly easy. It is similar to the one used in Matlab/Octave. We just use the syntax A[i-1:p,j-1:q], wherei,j are the positions from which we want to extract the p x q matrix, to get the desired answer. So, basically matrix is just storing a list of list as an array data structure. 
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.