adjoint(A)
adjoint(A,P)

The adjoint command computes the classical adjoint of a square matrix A, defined as the inverse of A multiplied by the determinant of A. If the matrix is singular then null is returned. An optional second argument P specifies the modulus.

Examples

A = [[1,2],[3,4]];
adjoint(A);
	[[4, -2], [-3, 1]]
1/A;
	[[-2, 1], [3/2, -1/2]]
determinant(A);
	-2
adjoint(A,11);
	[[4, 9], [8, 1]]