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# adding a condition to blkproc()

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Hassan on 8 Jul 2011
I use the following code to find the mean value of non-zero values of each block of an array. I wonder how I can add a condition to have a mean value if the number of non-zero values are bigger than 75% of the size of the block. I apperciate your help.
mean_wout_zeros = blkproc(Myarray,[block block],@(x)sum(x(:))./(sum(logical(x(:)))));
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### Answers (1)

Sean de Wolski on 8 Jul 2011
Just use this as your function
function out = meanZ75(in)
%mean sans zeros if there are 25% or more zeros
%pure mean if there are < 25% zeros
%SCd 07/11/2011
%
in = in(:);
if nnz(in) >= 0.25*length(in);
out = mean(in(~~in));
else
out = mean(in);
end
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Sean de Wolski on 15 Jul 2011
save
function out = meanZ75 etc.
to 'meanZ75.m' in your MATLAB folder in your documents. Then use it as the function for blkproc
blkoproc(new_array2(:,:,iu),[10 10],'meanZ75');

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