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D.15.10.25 intInverse

Procedure from library multigrading.lib (see multigrading_lib).

Purpose:
compute the integral inverse of the intmat A.
If det(A) is neither 1 nor -1 an error is returned.

Returns:
intmat

Example:
 
LIB "multigrading.lib";
intmat A[3][3] =
1,1,3,
3,2,0,
0,0,1;
intmat B = intInverse(A);
// should be the unit matrix
print(A * B);
==>      1     0     0
==>      0     1     0
==>      0     0     1
// another example
intmat C[2][2] =
2,1,
3,2;
intmat D  = intInverse(C);
// should be the unit matrix
print(C * D);
==>      1     0
==>      0     1
kill A, B, C, D;