[Octave-bug-tracker] [bug #45837] inputParser.addParamValue: failed validation for empty string

[Juan Pablo Carbajal]

Follow-up Comment #3, bug #45837 (project octave):

Therefore, if when the function ip_bug is called without arguments, the
validator

p.addParamValue ('Dir', def_dir, @ischar); 

gets and empty array (your default value) and it fails. This is consistent and
correct, since as you just saw [] is double not char.

Now, it might be that Matlab's inputParser is not calling the validator when
the default argument is given. I would deem that as a ML bug. Because it
allows for default initializations that cannot be passed as input arguments. 

The solution is to use consistent defautl values. in your case def_dir should
pass the validation step, therefore it should be 

+varbatim+
def_dir ="" 


or if you think that is ambiguous


def_dir = char([])





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