find a value and following values in a matrix

Hi, I have a matrix

A= [23 34 45 0 0 0; 21 34 0 0 23 11; 34 23 0 0 0 22]

I want to find if a value is present and if it's present, I want to find the following values.

Eg I want to find in A the value 23, if it's present I want like output a matrix only with 23 and its following values

B= [23 34 45 0 0 0; 0 0 0 0 23 11; 0 23 0 0 0 22]

Can you help me? thanks

Answer 1

[Andrei Bobrov]

out = (cumsum(A == 23,2)>0).*A