tresholding by summing over a dimension of a matrix

Hello,

I am trying to treshold data by summing over elemtns in the third dimension of a matrix and if the sum of all elements in a row of the third dimension is larger than a treshold value, all that row is set to NaN. However, I think the code I wrote must not be doing what I think it is since it is taking a very long time to compile.

Could you help me write some code please?

for c = 1:200000

for b = 1:32

for a= 1:32

if sum(micron_62frames(a,b,:),3) > 200000*65

micron_62frames(a,b,:) = NaN;

elseif sum(micron_62frames(a,b,:),3) < 200000*65

micron_62frames(a,b,:) = micron_62frames(a,b,:);

end

end

end

end

[Lucrezia Cester]

Hey I fixed it, outer loop was unnecessary

[David Goodmanson]

Also the elseif statement and the command that goes with it is unneccesary, since all you are doing with

micron_62frames(a,b,:) = micron_62frames(a,b,:)

is setting a bunch of stuff equal to what it is already.

Answer 1

[Andrei Bobrov]

k = size(micron_62frames,3);
lo = sum(micron_62frames,3) > 13e6;
micron_62frames(repmat(lo,1,1,k)) = nan;