Property value validation with values from file

Question

Marcel-Dennis Boerzel 2022-4-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1698110-property-value-validation-with-values-from-file

评论： Marcel-Dennis Boerzel 2022-4-24

I have a matlab class called Seq with the property seqName. Now I want to verify, if a value assigned to that property is a member of strings which are stored in a .csv file.

As I found https://de.mathworks.com/help/matlab/ref/mustbemember.html and

https://de.mathworks.com/help/matlab/matlab_oop/property-validator-functions.html

I can use mustBeMember

PropName {mustBeMember(seqName,{'movieNameA','movieNameB','movieNameC'})} = 'defaultMovieName'

But how can I replace {'movieNameA','movieNameB','movieNameC'} with an imported .csv file which contains the allowed values?

Thanks in advance

Dennis

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Marcel-Dennis Boerzel 2022-4-16

编辑：Marcel-Dennis Boerzel 2022-4-16

One additionally information. For me it is not important that it is a .csv-file. Any other importable filetype is ok for me as well.

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Answer 1

Steven Lord 2022-4-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1698110-property-value-validation-with-values-from-file#answer_944195

在 MATLAB Online 中打开

The census.mat file contains two variables, cdate and pop.

whos -file census.mat
  Name        Size            Bytes  Class     Attributes

  cdate      21x1               168  double              
  pop        21x1               168  double              

Let's write a function that will retrieve the data from one of those variables specified by the user.

y = example1698110('cdate')
y = 21×1
        1790
        1800
        1810
        1820
        1830
        1840
        1850
        1860
        1870
        1880
y = example1698110('pop')
y = 21×1
    3.9000
    5.3000
    7.2000
    9.6000
   12.9000
   17.1000
   23.1000
   31.4000
   38.6000
   50.2000
y = example1698110('notInCensus')
Error using solution>example1698110
Invalid argument at position 1. Value must be a member of this set:
    'cdate'
    'pop'
function y = example1698110(name)
arguments
    % Use a local validator that uses mustBeMember as part of its operation
    name string {validateNameInput(name)}
end
y = load('census.mat', name).(name);
end
function validateNameInput(name)
% Use whatever means necessary to assemble the list of acceptable strings
varnames = {whos('-file','census.mat').name};
mustBeMember(name, varnames)
end