How to avoid automatic conversion of complex to real?

Question

Lars Hansson 2023-3-23

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1933860-how-to-avoid-automatic-conversion-of-complex-to-real

回答： Bruno Luong 2023-3-23

I've encountered many difficult-to-find bugs due to how Matlab silently and automatically converts complex arrays to real, similar to this pattern:

% create complex array A
A = [0 + 0i, 0 + 1i];
% check if real
isreal(A)
ans = logical
   0
% create complex scalar x
x = complex(0 + 0i);
% check if real
isreal(x)
ans = logical
   0
% replace one value in A (complex) with x (complex)
A(2) = x;
isreal(A)
ans = logical
   1
% A is now real

Is there any way to avoid this automatic lowering to real (when encountering complex zeros)?

Since for large A it is unnecessarily expensive to have Matlab convert it to real, only for you to have to convert it back to complex.

I have tried to get support from Mathworks (as a service request), but they only say it is working as intended.

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Lars Hansson 2023-3-23

It makes no sense, since if you want to reduce the memory usage, why not convert all the way down to int8 or int1?The values are all zero after all :P

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