perm_matrix

synopsis: INT perm_matrix(OP a,b)

description:

computes the permutation matrix. This is the matrix with 1 at the place (a_i, i) and 0 elsewhere. The permutation a must be of the type VECTOR. a and b may be equal. the return value is OK if no error occured.

example:

 #include "def.h"
 #include "macro.h"

 ANFANG
 scan(PERMUTATION,a); println(a);
 perm_matrix(a,a); println(a);
 ENDE

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