How can I write a Matlab code on Digital Signals Processing ?

How can I write a MATLAB function (not a script!) to generate a periodic waveform of total length L. Each period must be a pulse of amplitude A that lasts a total ofM samples followed by T−M samples that are zero so that the overall period is T. The result should be a squarewave. Could you please help with this code, with a brief explaination of the code

[Stephen23]

Original question by Jone Erikson on 23rd August 2020 retrieved from Google Cache:

"How can I write a Matlab code on Digital Signals Processing ?"

How can I write a MATLAB function (not a script!) to generate a periodic waveform of total length L. Each period must be a pulse of amplitude A that lasts a total ofM samples followed by T−M samples that are zero so that the overall period is T. The result should be a squarewave. Could you please help with this code, with a brief explaination of the code

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Thiago Henrique Gomes Lobato]

This should work for you, the code is almost self explanatory:

L = 1024;
Periods = 4;
M = 128;
A = 1;
figure,plot( squareWave(L,M,Periods,A) )

function signal = squareWave(L,M,Periods,A)

    signal = zeros(L,1); %initialize signal with zeros

    if mod(L,Periods) ~= 0
        signal = -1; % False input data
    end
    T = L/Periods;  % Get length

    % Replace only non-zero values
    for idx=1:Periods
        signal( 1+(idx-1)*T:1+(idx-1)*T+M) = A;
    end
end

[Thiago Henrique Gomes Lobato]

Which error do you become? Here it works fine. Remember that you need to save it to a file and run, and not just evaluate it (F9).

[Stephen23]

Original comments by Jone Erikson retrieved from Google Cache:

The code above is not running Thigao

>> squareWave
Error: File: squareWave.m Line: 14 Column: 30
Function definitions are not permitted in this context.
Line 14:    signal(1+(idx-1)*T:1+(idx-1)*T+M)= A;

Also, why did you assume these values for: L, M, A, and Periods?