Field names in MATLAB struct arrays must satisfy three of the four criteria of a valid variable name as listed in the help for the isvarname function. They must:
- start with a letter, otherwise assigning to that field will error
- contain only letters, numbers, and/or the underscore character, otherwise assigning to that field will error, and
- must be no longer than namelengthmax (currently 63) characters, otherwise you will receive a warning and the field name will be truncated
It is possible to assign to a field whose name is a keyword, though I would advise against it unless absolutely necessary. And trying to save that struct with the -struct option probably won't work, or if it does trying to load that MAT-file will likely cause a headache for you in the future.
S = struct;
S.end = 42
To convert your potential field name into one that is valid, consider using matlab.lang.makeValidName and potentially matlab.lang.makeUniqueStrings.
