Question about Use property validation

Question

Derek Jing 2022-2-11

0
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https://ww2.mathworks.cn/matlabcentral/answers/1648025-question-about-use-property-validation

回答： Steven Lord 2022-2-11

The property definition of my class is as following:

classdef ClassName

properties

prefNames@string vector = string.empty;

numPrefs@uint8 scalar = 0;

end

.......

I got warning as following:

Warning: Class 'ClassName' uses an undocumented syntax to restrict property values. Use property

validation syntax instead. This warning will become an error in a future release.

I checked Matlab help and see I shall ue following sytax

Prop(dim1,dim2,...) classname (func1, func2,...) = default value

So I convert above property definition as following:

prefNames string = string.empty;

numPrefs uint8 = 0;

My question is: how to define the size of the string vector in the property validation when the size of the vector is unknown in advance

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Derek Jing 2022-2-11

or following

prefNames(:,1) string = string.empty;

numPrefs(1,1) uint8 = 0;

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Answer 1

Steven Lord 2022-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/1648025-question-about-use-property-validation#answer_894185

You can use a colon in the size validation section of the property definition (see Property Size Validation on this documentation page) or if you don't want to restrict the prefNames to be a row vector or a column vector (just make it be a vector or an empty) use the mustBeVector property validation function (with the "allow-all-empties" option since your default value is an empty not a vector.)