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D.3.1.21 permcol

Procedure from library matrix.lib (see matrix_lib).

Usage:
permcol(A,c1,c2); A matrix, c1,c2 positive integers

Return:
matrix, A being modified by permuting columns c1 and c2

Example:
 
LIB "matrix.lib";
ring r=32003,(x,y,z),lp;
matrix A[3][3]=1,x,3,4,y,6,7,z,9;
print(A);
==> 1,x,3,
==> 4,y,6,
==> 7,z,9 
print(permcol(A,2,3));
==> 1,3,x,
==> 4,6,y,
==> 7,9,z

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