15.4.1  Frobenius norm

The Frobenius norm of a matrix A is √∑_i,j a_i,j². The frobenius_norm command finds the Frobenius norm of a matrix.

• frobenius_norm takes A, a matrix.
• frobenius_norm(A) returns the Frobenius norm of A.

Example

Indeed, √1²+2²+3²+3²+(−9)²+6²+4²+5²+6²= √217.