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D.3.1.27 rm_unitcol

Procedure from library matrix.lib (see matrix_lib).

Usage:
rm_unitcol(A); A matrix (being row-reduced)

Return:
matrix, obtained from A by deleting unit columns (having just one 1 and else 0 as entries) and associated rows

Example:
 
LIB "matrix.lib";
ring r=0,(A,B,C),dp;
matrix m[6][8]=
0,  0,    A,   0, 1,0,  0,0,
0,  0,  -C2,   0, 0,0,  1,0,
0,  0,    0,1/2B, 0,0,  0,1,
0,  0,    B,  -A, 0,2A, 0,0,
2C,-4C,  -A,   B, 0,B,  0,0,
0,  A,    0,   0, 0,0,  0,0;
print(rm_unitcol(m));
==> 0, 0,  B, -A,2A,
==> 2C,-4C,-A,B, B, 
==> 0, A,  0, 0, 0