inputparser fails to accept correct value

I'm currently trying to get the inputparser for my function to work. My code looks like this:

function [] = Test2 (BW,varargin)
defMethod        = 2;

p = inputParser;
validImage = @(x) islogical(x);
addRequired(p,'BW',validImage);
addParameter(p,'method',defMethod,@(x) isinteger(x) && (x<3) && (x>0));
parse(p,BW,varargin{:});

Running this codes yields the following result:

Test2(BW,'method',1);

The value of 'method' is invalid. It must satisfy the function: @(x)isinteger(x)&&(x<3)&&(x>0).

Does anyone know what is causing this behaviour?

Ty for your help!

[Adam Danz]

Test2() is a different function than Test(). Was it a typo?

[xCuse]

yes sorry it was a typo

Answer 1

[Adam Danz]

isinteger(1)   % = FALSE

This matlab function (which often causes confusion) does not determine if the input has an integer value. It determines if the intput is an interger-type (int8, int16, etc...). The input 1 is of class double, not integer-type.

https://www.mathworks.com/help/matlab/ref/isinteger.html

If you need to determine if the input is an integer value,

@(x) mod(x,1)==0 && (x<3) && (x>0));

[xCuse]

Thank you very much, that solved it for me!

[Adam Danz]

Also, this

validImage = @(x) islogical(x);
addRequired(p,'BW',validImage);

can be simplified to this

addRequired(p,'BW',@islogical);

but if you want to accept true, false, 1, 0,

validImage = @(x) islogical(x) || (isnumeric(x) && ismember(x,[0,1]));
addRequired(p,'BW',validImage);

[xCuse]

Tyvm, every simplification is welcome! :)