Why does the "Matrix dimensions must agree" error persists?

Question

Walter Fabián 2024-5-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2117266-why-does-the-matrix-dimensions-must-agree-error-persists

编辑： Hassaan 2024-5-10

Good evening, I'm trying to plot an audiorecording with an Fs = 8KHz in appdesigner. I created a dropdown but idk why this error remains. I uploaded some images so u can understand me. I'd really apreciate it, its really important to figure it out. Thanks a lot.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

sai charan sampara 2024-5-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2117266-why-does-the-matrix-dimensions-must-agree-error-persists#answer_1455526

Hello Walter,

When using "plot" in the format of "plot(ax,x,y)" the size of the variable "x" and "y" must be same. In your case make sure the size of the variables "t" and "y" are same. If they are not same you can try defining "t" such that it has the same length as "y".

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Hassaan 2024-5-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2117266-why-does-the-matrix-dimensions-must-agree-error-persists#answer_1455536

编辑：Hassaan 2024-5-10

在 MATLAB Online 中打开

To give an initial idea:

% Example MATLAB code to plot an audio recording

% Sample rate

Fs = 8000; % 8 kHz

% Create a dummy audio signal (e.g., a sine wave for demonstration)

t = 0:1/Fs:1-1/Fs; % Create a time vector for 1 second of audio

frequency = 440; % Frequency of the sine wave (A4 pitch)

audioData = sin(2 * pi * frequency * t); % Generate audio data

% Plot the audio data

figure;

plot(t, audioData);

xlabel('Time (seconds)');

ylabel('Amplitude');

title('Audio Signal');

grid on;

% Dummy function to simulate dropdown callback in App Designer

function dropdownCallback(app, event)

frequency = str2double(app.DropDown.Value); % Get frequency from dropdown

% Recreate the audio signal with the new frequency

audioData = sin(2 * pi * frequency * t); % Generate new audio data

% Update the plot

plot(app.UIAxes, t, audioData); % Assume 'UIAxes' is your App Designer axis

xlabel(app.UIAxes, 'Time (seconds)');

ylabel(app.UIAxes, 'Amplitude');

title(app.UIAxes, ['Audio Signal at ', num2str(frequency), ' Hz']);

end

-----------------------------------------------------------------------------------------------------------------------------------------------------

If you find the solution helpful and it resolves your issue, it would be greatly appreciated if you could accept the answer. Also, leaving an upvote and a comment are also wonderful ways to provide feedback.

It's important to note that the advice and code are based on limited information and meant for educational purposes. Users should verify and adapt the code to their specific needs, ensuring compatibility and adherence to ethical standards.

Professional Interests