Average of group of non zero elements in an array

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Prasanna Venkatesh
Prasanna Venkatesh 2018-2-27
编辑： Stephen23 2018-2-27
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.

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Stephen23
Stephen23 2018-2-27
编辑：Stephen23 2018-2-27
>> 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

更多回答（1 个）

Prasanna Venkatesh
Prasanna Venkatesh 2018-2-27
Thank you! that works perfectly.
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Stephen23
Stephen23 2018-2-27
编辑：Stephen23 2018-2-27
@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.

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