norm square

How to implement equation:

CRE=||Pu||^2

P is a matrix

Answer 1

[Wayne King]

Is Pu a vector resulting from multiplying a vector by a matrix

P = randn(2,2);
u = randn(2,1);
norm(P*u,2)

[Jaromir Kabelac]

This is not true.

norm(x, 2)

is the same as

norm(x)

and calculates the 2-norm (or Euclidian norm) of x, which could be denoted as , or usually just as .

What you probably want is the square of the norm, hence

norm(x)^2

Answer 2

[Jonathan Sullivan]

Have you tried

CRE = norm(P)^2;

help norm
doc norm