Is there only one line? If not, I think you can have a plastic surgery first:

A=[ ...

0 0 0 0 0

0 0 0 0 0

2 5 0 0 0

0 0 2 5 0

0 0 0 0 2 ];

A = shape(A， 1，[])；

c = 1:max(a)；

B=histc(a，C)

result

B =

0 3 0 0 2

Also, when you say histogram, everyone will understand what you mean, O(∩_∩)O~