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From: mat001 on 17 May 2010 08:22
How to find non zero element in Matrix

I have a matrix A with lots of Zero and I have to take average of only that element which is non zero.
From: mat001 on 17 May 2010 08:27
"mat001 " <priya.biomath(a)yahoo.co.in> wrote in message <hsrcdc$i8m$1(a)fred.mathworks.com>...
> How to find non zero element in Matrix
>
> I have a matrix A with lots of Zero and I have to take average of only that element which is non zero.

Will it work like that

average = sum(nonzeros(A(:)))/numel(nonzeros(A(:)))
From: Sean on 17 May 2010 08:31
"mat001 " <priya.biomath(a)yahoo.co.in> wrote in message <hsrcdc$i8m$1(a)fred.mathworks.com>...
> How to find non zero element in Matrix
>
> I have a matrix A with lots of Zero and I have to take average of only that element which is non zero.

>>a = rand(10).*(rand(10)>.5);
>>b = a(a~=0);
>>mean(b)

or
>>a(a==0) = nan;
>>nanmean(a);
From: ImageAnalyst on 17 May 2010 08:31
It should work, but you can replace
numel(nonzeros(A(:)))
with
nnz(A)
From: Matt J on 17 May 2010 09:22
"mat001 " <priya.biomath(a)yahoo.co.in> wrote in message <hsrcmo$8is$1(a)fred.mathworks.com>...
> "mat001 " <priya.biomath(a)yahoo.co.in> wrote in message <hsrcdc$i8m$1(a)fred.mathworks.com>...
> > How to find non zero element in Matrix
> >
> > I have a matrix A with lots of Zero and I have to take average of only that element which is non zero.
>
> Will it work like that
>
> average = sum(nonzeros(A(:)))/numel(nonzeros(A(:)))

This can be replaced simply with

mean(nonzeros(A));
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