|  |  4.7.1 intmat declarations 
 
Syntax:
intmatname=intmat_expression;
 intmatname[rows] [cols] =intmat_expression;
 intmatname[rows] [cols] =list_of_int_and_intvec_and_intmat_expressions;rows and cols must be positive int expressions.
 
Purpose:
defines an intmat variable.
Given a list of integers, the matrix is filled up with the first row
from the left to the right, then the second row and so on.
If the int_list contains less than rows*cols elements,
the matrix is filled up with zeros; if it contains more
elements, only the first rows*cols elements are used.
 
Default:
0 (1 x 1 matrix)
Example:
|  |   intmat im[3][5]=1,3,5,7,8,9,10,11,12,13;
  im;
==> 1,3,5,7,8,
==> 9,10,11,12,13,
==> 0,0,0,0,0 
  im[3,2];
==> 0
  intmat m[2][3] = im[1..2,3..5];  // defines a submatrix
  m;
==> 5,7,8,
==> 11,12,13 
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