Is there a built-in function to validate a class property that should be a cell array?

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Bill Tubbs
Bill Tubbs 2022-6-4
编辑： Bill Tubbs 2022-6-6
I'm new to classes and learning about how to define properties and validate their values.
I have a class with a property A that is a cell array of doubles (possibly matrices). For example:
A =
1×2 cell array
{[0.7000]} {[0.9000]}
classdef MKFObserver < matlab.mixin.Copyable
properties (SetAccess = immutable)
Ts {mustBeNumeric}
n {mustBeInteger}
%...etc
end
properties
A % how to validate this?
B
C
D
P {mustBeNumeric}
Q {mustBeNumeric}
R {mustBeNumeric}
%...etc
end
Can I use a built in function like {mustBeNumeric} or do I need to write my own validation function?
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Bill Tubbs
Bill Tubbs 2022-6-4
编辑：Bill Tubbs 2022-6-4
Thanks. That will do the first part. But I'll have to upgrade my MATLAB now! (Introduced in R2020b). I admit I have been putting it off for too long...

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采纳的回答

Edric Ellis
Edric Ellis 2022-6-6
Ran in:
Rather than a validator, you could perhaps just use the class specification? (In my code below I'm using a function with an arguments block, but the syntax is exactly the same as a properties block in a classdef). Note that this will accept anything that can be converted to a cell, if you care about distributed arrays, then you should use the approach suggested by @Sean de Wolski.
myFcn({1,2}); % works
myFcn([1,2]); % fails
Error using solution>myFcn
Invalid argument at position 1. Value must be of type cell or be convertible to cell.
function myFcn(in)
arguments
in (1,2) cell
end
% do stuff
end
  1 个评论
Bill Tubbs
Bill Tubbs 2022-6-6
编辑：Bill Tubbs 2022-6-6
This worked! I just did this:
classdef MKFObserver < matlab.mixin.Copyable
properties
A cell
B cell
%...etc
% Test:
>> MKFObserver([0.7 0.9], ...)
Error setting property 'A' of class 'MKFObserver':
Invalid data type. Value must be cell or be convertible to cell
It doesn't check the underlying type of the elements of the cell array but I decided in the end I don't want this level of validation. Thanks.

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更多回答（2 个）

Matt J
Matt J 2022-6-4
编辑：Matt J 2022-6-4
There is always iscell():
classdef
...
methods
function obj=set.A(obj,A)
assert(iscell(A),'Value assigned to A must be cell array');
obj.A=A;
end
end
end
Sean de Wolski
Sean de Wolski 2022-6-5
编辑：Sean de Wolski 2022-6-5
Ran in:
I think you'll have to write your own. Must be underlying type is for distributed, gpuArrays and others that masquerade as the underlying type.
mustBeUnderlyingType({pi},'double')
Value must have underlying type 'double'.
You could probably get away with this as your validator: cellfun(@(x)mustBeA(x, 'double'),PropertyName)
c = {pi,magic(3)}
d = {pi, "hello"}
cellfun(@(x)mustBeA(x, 'double'),c)
cellfun(@(x)mustBeA(x, 'double'),d)

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