How to calculate the mean excluding zero voxels

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Gina Carts
Gina Carts 2020-4-29
回答： Walter Roberson 2020-4-29
Hi,
I have a mask with different regions marked with values 1,2,3 and 4. The background is zero.
My data have some NaNs so I set those to 0. I then calculated the mean of my regions but in some cases there were NaNs and now are zero. I want to exclude these voxels from my calculation. My code is the following:
blood(isnan(blood))=0;
bloodmean = accumarray(double(mask(:))+1, blood(:), [], @mean)
Can someone help me to exclude the zero voxels from my calculation?

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回答（1 个）

Walter Roberson
Walter Roberson 2020-4-29
Leave the nans as nan, and then
bloodmean = accumarray(double(mask(:))+1, blood(:), [], @nanmean, 0);

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