How the computation happening : sum(A~=0,2)

> A

A =

1 2 3

4 5 6

7 8 9

>> sum(A)

ans =

12 15 18

>> sum(A~=0,2)

ans =

3

3

3

Answer 1

[madhan ravi]

>>A~=0 % creates a logical matrix so when you sum along rows, you get three

ans =

  3×3 logical array

   1   1   1
   1   1   1
   1   1   1

>> sum(ans,2)

ans =

     3
     3
     3

>> sum(A,2) % perhaps you mean't to do this

ans =

     6
    15
    24