A null assignment can have only one non-colon index.

Question

Sandhiya Prakash 2017-3-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/329744-a-null-assignment-can-have-only-one-non-colon-index

回答： Arpan Bhowmik 2019-2-20

My code is

for I=2:160
for J=2:216
for K=2:176
conventional = data(I-1:I+1, J-1:J+1, K-1:K+1);
mean_conventional = mean2(conventional);
unconventional = conventional;
unconventional(2,2,2) = []; %center point not included in mean
mean_unconventional = mean2(unconventional);
end
end
end

Error is A null assignment can have only one non-colon index.

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Answer 1

Arpan Bhowmik 2019-2-20

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/329744-a-null-assignment-can-have-only-one-non-colon-index#answer_361901

Given that you have a 3D array in unconventional (based on you calling (2,2,2) the center point), that means you have a 3X3X3 array from which you are trying to delete the center point. This will leave a hole when you do a null assignment and your array will have mismatched dimensions (you cannot stitch a vector with 3 elements with one containing 2 to create a 3X2 or 2X3 aray). Try instead assigning with 0 or nan, based on what you are trying to do in mean2.