error when using 'find' function

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Sunil S Hosakoti
Sunil S Hosakoti 2020-5-27
评论： Sunil S Hosakoti 2020-6-3
Hi
i actually want to find the first the first and last non zero row to avoid the edge effects and enforce them to zero for my analysis. But when i try running the code, i get this error - 'Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 0-by-1'. Here is the part of code that gives the error.
idxo1 = zeros(size(U_col,2),size(U_col,3));
idxo2 = zeros(size(U_col,2),size(U_col,3));
for j =1:size(U_col,3)-1
for k = 1:size(U_col,2)-1
idxo1(k,j) = find(EffectiveDivergence(:,k,j), 1, 'first');
idxo2(k,j) = find(EffectiveDivergence(:,k,j), 1, 'last');
end
end
5 and 6th line are giving the errors.
Thanks

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Rik
Rik 2020-5-27
If you store output of the find function to a temporary variable, you will notice that the error occurs when that temporary variable is empty.
If you can't guarantee a non-zero value can be found you need to think about a mitigation. Do you want to store a NaN? A zero?
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Sunil S Hosakoti
Sunil S Hosakoti 2020-5-28
编辑：Sunil S Hosakoti 2020-5-29
I want to remove the encircled parts which is actually a transient efffect (basically an artifact). I am only interested in what happens beneath that tip. So in every frame i want to enforce that first non-zero occuring row to zero. I have about 200 frames for each experiment. If i don't, that single horizontal line in the first image develops into a huge band which is undesirable.
Sunil S Hosakoti
Sunil S Hosakoti 2020-6-3
It was a problem due to the presence of NaN in the array. Got it sorted out.
Thanks a lot for your time and help.

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