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

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.

Answer 1

[Arpan Bhowmik]

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.