input parser on a cell array

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

Answer 1

[Rik]

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

[Stephen23]

fcn = @(A) ...
    iscellstr(A) && ...
    size(vertcat(A{:}),2)==4 && ... <- fails if the text have different lengths
    all(isstrprop([A{:}],'digit'));
fcn({'a','1234'})

Error using vertcat
Dimensions of arrays being concatenated are not consistent.

Error in solution (line 3)
size(vertcat(A{:}),2)==4 && ... <- will fail if the text have different lengths

Perhaps:

all(cellfun(@length,A)==4)

[Rik]

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]

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.