I Need the matlab code for the attach equation.

Actually I need a single value from this equation where sub_band (p,q) is a matrix.

[KL]

What have you tried?

[Jan]

The equation provides a single value already. What have you tried so far? What is the specific problem?

Answer 1

[Jan]

A = mean(sub_band(:) .^ 2);

[tania manna]

thank you.

A = mean(sub_band(:) .^ 2); or

A = mean(mean(sub_band(:) .^ 2));

[Jan]

The first is a scalar already, so the second mean() has no effect.

Answer 2

[Torsten]

[p q] = size(sub_band);
A = sum(diag(sub_band.'*sub_band))/(p*q);

Best wishes

Torsten.