Why do I get“Error using plot Vectors must be the same length."

Please tell me how to correct it.

Ts = 0.001;
fs = 1/Ts; 
To = 0.5;
t = 0:Ts:To-Ts;
N = length(t);

d = [0 1 0 1;0 0 1 1;1 0 1 0;1 1 0 0]; 

Ibranch = d(1:2:end); 
Qbranch = d(2:2:end);

Im = [];
Qm = [];
for k1 = 1:length(Ibranch)
    Im = [Im Ibranch(k1)*ones(1, N)];
    Qm = [Qm Qbranch(k1)*ones(1, N)];
end
figure(1);
subplot(2,1,1);

plot(t, Im);

Error using plot
Vectors must be the same length.

title('In-Phase Pulse Waveform');
xlabel('Time (s)');
ylabel('Amplitude');
subplot(2,1,2);
plot(t, Qm);
title('Quadrature Pulse Waveform');
xlabel('Time (s)');
ylabel('Amplitude');

[Walter Roberson]

Im = [];
Qm = [];
for k1 = 1:length(Ibranch)
    Im = [Im Ibranch(k1)*ones(1, N)];
    Qm = [Qm Qbranch(k1)*ones(1, N)];
end

What are you trying to do? Have you considered repelem ? Not that it is at all clear to me why you are replicating the values.

Answer 1

[Cris LaPierre]

Make sure t and Im have the same number of elements.

Ts = 0.001;
To = 0.5;
t = 0:Ts:To-Ts;
N = length(t);

d = [0 1 0 1;0 0 1 1;1 0 1 0;1 1 0 0]; 

Ibranch = d(1:2:end); 

Im = [];
for k1 = 1:length(Ibranch)
    Im = [Im Ibranch(k1)*ones(1, N)];
end

size(t)

ans = 1×2

1 500

size(Im)

ans = 1×2

1 4000

[Chris]

Sorry, but what method should I use to improve it？

[Cris LaPierre]

I'm not sure what you are trying to do. Best option may be to remove the for loop. Once you understand why this works, start adding to the code until you get a working final solution.

Ts = 0.001;
To = 0.5;
t = 0:Ts:To-Ts;
N = length(t);

d = [0 1 0 1;0 0 1 1;1 0 1 0;1 1 0 0]; 

Ibranch = d(1:2:end); 

k1 = 1;
Im = Ibranch(k1)*ones(1, N);

size(t)

ans = 1×2

1 500

size(Im)

ans = 1×2

1 500

plot(t, Im);
title('In-Phase Pulse Waveform');
xlabel('Time (s)');
ylabel('Amplitude');