whats the diffrence in max methods ?

what is diffrence between given 2 code?

a(g)=max(p(i,g));

&

a(g)=max(p(:,g));

both gives diffrent answer why ?

Answer 1

[KSSV]

a(g)=max(p(i,g)); 

The above gives maximum in array p(i,g). If p(i,g) is a scalar, the same value you will get.

a(g)=max(p(:,g));

In the above ,: stands for all, as it is present in the rwo, p(:,g) picks the entire gth column in p. And max gives you maximum in the gth column of p.