## Count the index of the array

### Mekala balaji (view profile)

on 20 Dec 2014
Latest activity Commented on by madhan ravi

on 3 Dec 2018

### Azzi Abdelmalek (view profile)

Hi, I have a array like below: [0 0 0 0 0 0 0 0 0 10 0 0 0 0 15 0 17]
I want count how many numbers >0 in the array (like in this case count is 3 (because 10,15,&17). Can some please help me how to count this in matlab. Thanks in advance

### Azzi Abdelmalek (view profile)

on 20 Dec 2014

If your array doesn't contain negative numbers
a=[0 0 0 0 0 0 0 0 0 10 0 0 0 0 15 0 17]
out=nnz(a)

Shoaibur Rahman

### Shoaibur Rahman (view profile)

on 20 Dec 2014
nnz will count the number of all non-zero elements in the array, including negatives. So, this function would be a better choice if you want to do so.
Mekala balaji

### Mekala balaji (view profile)

on 20 Dec 2014
Great Thank you sir

### Shoaibur Rahman (view profile)

on 20 Dec 2014

A=[0 0 0 0 0 0 0 0 0 10 0 0 0 0 15 0 17];
sum(A>0)

on 3 Dec 2018

n=numel(A);