|  |  D.3.1.21 permrow Procedure from librarymatrix.lib(see  matrix_lib).
 
Example:Usage:
permrow(A,r1,r2); A matrix, r1,r2 positive integers
Return:
matrix, A being modified by permuting rows r1 and r2
 |  | LIB "matrix.lib";
ring r=32003,(x,y,z),lp;
matrix A[3][3]=1,2,3,x,y,z,7,8,9;
print(A);
==> 1,2,3,
==> x,y,z,
==> 7,8,9 
print(permrow(A,2,1));
==> x,y,z,
==> 1,2,3,
==> 7,8,9 
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