Illegal use of reserved keyword

        function PLAYNOTE(app,frequency)

            FreqString=num2str(frequency);
            app.Label.Text=FreqString;
            %https://www.mathworks.com/help/signal/ug/edit-time-information-in-the-signal-analyzer-app.html
            %below details can be obtained from the above mentioned websites./
            SampleRate  = app.samplerate;
            TimeValue   = app.timevalue;
            TimeSamples  = 0:SampleRate:TimeValue;
            FORSINE=app.SINE.Value;
            FORSQUARE=app.SQUARE.Value;
            FORSAWTOOTH=app.SAWTOOTH.Value;

            if FORSINE == 1
                soundVector = sin(2*pi*frequency*TimeSamples);
             elseif FORSQUARE == 1
                soundVector = square(2*pi*frequency*TimeSamples);
             elseif FORSAWTOOTH == 1
                soundVector = sawtooth(2*pi*frequency*TimeSamples);
            end
            sound(soundVector, 1/SampleRate)
            CheckRecord=app.RECORD.Value;
            if CheckRecord == 1
                SOUNDCOMPOSE=app.Soundvector;

                if SOUNDCOMPOSE == 0
                    SOUNDCOMPOSE=soundVector;

                else
                    SOUNDCOMPOSE=cat(2,SOUNDCOMPOSE,soundVector);
                end
                app.Soundvector=SOUNDCOMPOSE;
            end
        end

    methods (Access = private)%showing error at this line....Illegal use of reserved keyword"methods"

Answer 1

[Steven Lord]

This looks like a portion of an App Designer app, and if it is that is indeed a classdef file. Looking at the end keywords, the last one before the methods line ends the function. There is no end ending the previous methods block. You can't start a methods block inside another methods block.

end the methods block that contains PLAYNOTE before starting another one for your private methods.

Answer 2

[Guillaume]

Unless that function is in a larger file which is a class definition (i.e. the very first line of the file except for comments is classdef something, then yes that methods ... line is illegal.

Since it doesn't sound that your file is a class definition (otherwise you'd have said, I hope), what exactly were you hoping to achieve with that method line?

[Monojit Chatterjee]

I dont understand what you said.