Matlab - Class : how to declare an internal function returning a value

Question

Yoshua CELNIKIER 2022-12-16

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评论： Yoshua CELNIKIER 2022-12-17

Hi all, I am trying to declare an internal function (findScenarioNumber) in a class. This function is supposed to output a number. But I have an error in the line "scenarioNumber = findScenarioNumber(splitDataFolder);" where I'm calling the function: Undefined function 'findScenarioNumber' for input arguments of type 'cell'. Searching but cannot find the good syntax to do that. Anyone can help ?

Here is my code :

classdef SignalStructureProperty < handle
    
    properties
        signals
    end
    
    methods
        
        function obj = createSignalTopLevelStructure(obj,dataFolder)
            splitDataFolder = split(dataFolder,'\');
            scenarioNumber = findScenarioNumber(splitDataFolder);
            obj.signals.metaData.scenarioNumber = scenarioNumber;
        end
        
        function scenarioNumber = findScenarioNumber(splitDataFolder)
            scenarioNumber = NaN;
            if(~isempty(splitDataFolder))
                for i=1:length(splitDataFolder)
                    if(contains(splitDataFolder{i},'SCN'))
                        scenarioNumber = str2double(extractAfter(splitDataFolder{i},"SCN"));
                    end
                end
            end
        end
        
    end   
    
end

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Answer 1

Jon 2022-12-16

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编辑：Jon 2022-12-16

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You must tell MATLAB that findScenarioNumber is a member function of the class you are currently in

scenarioNumber = obj.findScenarioNumber(splitDataFolder)

You must use obj as the first argument

function scenarioNumber = findScenarioNumber(obj,splitDataFolder)

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Yoshua CELNIKIER 2022-12-17

Makes the job. Thanks a lot

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Answer 2

Steven Lord 2022-12-16

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I would make findScenarioNumber a class-related function rather than a method of the class. See this documentation page for an example of this technique.