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balancedtiger avatar balancedtiger commented on May 18, 2024

This is because ans._id is not a valid matlab field name.

A valid field name is created by first prepending x0x and then providing the hexadecimal representation of i.e.

dec2hex('_') = 5F

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fangq avatar fangq commented on May 18, 2024

@Andy1978, the answer provided by @balancedtiger is correct. special characters have to be converted first to use in MATLAB.

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Andy1978 avatar Andy1978 commented on May 18, 2024

Okay, so this looks like a MATLAB only workaround(?) because ans._id works in GNU Octave without problem.

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fangq avatar fangq commented on May 18, 2024

this is not a workaround, matlab variable naming rules have been there since 80's.

https://www.mathworks.com/help/matlab/matlab_prog/variable-names.html
https://www.mathworks.com/help/matlab/ref/isvarname.html
https://www.mathworks.com/help/matlab/ref/genvarname.html

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