input parser on a cell array

Question

Paul Mitchell 2023-2-27

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编辑： Paul Mitchell 2023-2-27

I have an input cell array example A = {'1234','4567','8901'}

I wish to user the input parser addParameter to check each entry is a string, and also each string is only composed of a set of 4 numbers

is there anyway in which to do this ? I have been searching Help and Answers but cannot find anything

Thank You

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Answer 1

Rik 2023-2-27

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You can implement a custom validationFcn to check your requirements, as you can read in the documentation.

A = {'1234','4567','8901'};
fcn = @(A) ...
    iscellstr(A) && ...
    size(vertcat(A{:}),2)==4 && ...
    all(isstrprop([A{:}],'digit'));
fcn(A)
ans = logical
   1
fcn({'1abc','1234'})
ans = logical
   0

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Rik 2023-2-27

编辑：Rik 2023-2-27

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From what I can tell from the documentation, a fail is interpreted as invalid input, so my function should work. Although it is indeed more elegant to have this function not fail.

If any of those chars is a column vector this code will still return an error.

So perhaps:

all(cellfun('size',A,2)==4) && all(cellfun('size',A,1)==1)

Paul Mitchell 2023-2-27

编辑：Paul Mitchell 2023-2-27

Rik / Stephen - Thank You both very much for taking the time to look at solving my issue. It is much appreciated. Rik your origonal post solved my problem perfectly.

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