Issue with cwtft2 Function in MATLAB R2024b

Dear Support Team,

I have encountered an issue with the cwtft2 function in MATLAB R2024b. In MATLAB R2021a, this function accepts complex matrices without any problems. However, in R2024b, the same function throws an error when provided with complex input.

For example, the following command works in R2021a but fails in R2024b:

cwtft2(randn(4) + 1i * randn(4))

Error using wavelet.internal.cwt2.cwt2 (line 8)
Invalid argument at position 1. Value must be real.

Error in cwtft2 (line 103)
cwtstruct = wavelet.internal.cwt2.cwt2(X,varargin{1:max(0,plotIDX-1)},varargin{plotIDX+1:end});

Could you clarify why this change has occurred? Additionally, how can I use cwtft2 with complex matrices in the newer version (R2024b)?

Thank you for your assistance.

Best regards,

[Torsten]

This is only a MATLAB forum giving help "from user to user".

You should address your question directly to the Mathworks Support Team:

https://uk.mathworks.com/support/contact_us.html

[Walter Roberson]

It is true that the documentation for the function does not mention that the parameter needs to be real-valued, so it is understandable to expect complex-valued data to work.

Answer 1

[Aastha]

Hi @Kobi,

I tried to use complex values as input to “cwtft2” function in MATLAB R2024b and got a similar error.

In the MathWorks documentation for “cwtft2” function, the section “Input Arguments” does not mention “Complex Number Support: Yes”; whereas if you see the documentation of functions that accept complex inputs such as “transpose” function, the “Input Arguments” section mentions “Complex Number Support: Yes” which implies that the function intends to accept complex-valued arguments.

You can contact MathWorks Technical Support for the workaround.

Kindly refer to the documentation links of “cwtft2” and “transpose” functions for any further queries:

• cwtft2: https://www.mathworks.com/help/wavelet/ref/cwtft2.html
• transpose: https://www.mathworks.com/help/matlab/ref/double.transpose.html

I hope this is helpful!