Average of group of non zero elements in an array

Hello, I have an array such as

A=[ 0 0 0 0 4 3 5 6 7 0 0 0 0 2 3 4 5 0 0 0] for example.

I want to display the average of all the groups of non zero elements of this array individually. So the above output should give me the average of [4 3 5 6 7] and [ 2 3 4 5] separately. I need this to apply to a problem I have where I have a signal that has non zero values at different intervals and I am trying to find the average values of all such non zero durations individually.

Any help is appreciated.

Thanks.

Answer 1

[Stephen23]

>> A = [0,0,0,0,4,3,5,6,7,0,0,0,0,2,3,4,5,0,0,0];
>> D = diff([true;A(:)==0;true]);
>> idb = find(D<0);
>> ide = find(D>0)-1;
>> C = arrayfun(@(b,e)A(b:e),idb,ide,'uni',0);
>> C{:}
ans =
   4   3   5   6   7
ans =
   2   3   4   5

Or to get the means:

>> arrayfun(@(b,e)mean(A(b:e)),idb,ide)
ans =
   5.0000
   3.5000

Answer 2

[Prasanna Venkatesh]

Thank you! that works perfectly.

[Stephen23]

@Prasanna Venkatesh: thank you. Remember to accept the answer that helps you most: this gives us reputation points, and shows that your question has been resolved.