I have the following code in Matlab, the problem is that it does not graph anything, nothing comes out of plot *does not show any error in the console

Question

Sonia 2022-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/1881412-i-have-the-following-code-in-matlab-the-problem-is-that-it-does-not-graph-anything-nothing-comes-o

评论： Image Analyst 2022-12-19

fc1=0.33;
fc2=0.83;
f=[fc1,fc2];
h=fir1(64,f,'stop');
[samplerate.data]=audioread("Domini_Fil.wav");
plot(data)
filteredData=filtfilt(h,1,data);
plot(filteredData);
[w,rh]=freq(h,1,64);
w_pi=(w/pi)*6;
plot(w_pi,abs(rh));
fft_input=fft(data);
fft_output=fft(filteredData);
plot(abs(fft_input));
plot(abs(fft_output));

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Answer 1

Cris LaPierre 2022-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/1881412-i-have-the-following-code-in-matlab-the-problem-is-that-it-does-not-graph-anything-nothing-comes-o#answer_1131717

编辑：Cris LaPierre 2022-12-19

在 MATLAB Online 中打开

Attach your wav file to your question using the paperclip icon. It would also help to have your freq function code. Still, using a built-in wav file (bluewhale.wav), there doesn't appear to be anything wrong with your code. Perhaps your file does not have any data?

fc1=0.33;

fc2=0.83;

f=[fc1,fc2];

h=fir1(64,f,'stop');

[data]=audioread("bluewhale.wav");

plot(data)

filteredData=filtfilt(h,1,data);

plot(filteredData);

% [w,rh]=freq(h,1,64);

% w_pi=(w/pi)*6;

% plot(w_pi,abs(rh));

fft_input=fft(data);

fft_output=fft(filteredData);

plot(abs(fft_input));

plot(abs(fft_output));

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Answer 2

Image Analyst 2022-12-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1881412-i-have-the-following-code-in-matlab-the-problem-is-that-it-does-not-graph-anything-nothing-comes-o#answer_1131722

在 MATLAB Online 中打开

Try calling

hold on

after your first call to plot.

If you have any more questions, then attach your data ("Domini_Fil.wav") with the paperclip icon after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

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Sonia 2022-12-19

where do i put hold on?

Image Analyst 2022-12-19

在 MATLAB Online 中打开

After the first call to plot, if you want them all on the same graph. Or use subplot if you want them in separate graphs.

fc1=0.33;
fc2=0.83;
f=[fc1,fc2];
h=fir1(64,f,'stop');
[samplerate.data]=audioread("Domini_Fil.wav");
plot(data)
hold on; % Prevent subsequent plots from blowing away earlier ones.
filteredData=filtfilt(h,1,data);
plot(filteredData);
[w,rh]=freq(h,1,64);
w_pi=(w/pi)*6;
plot(w_pi,abs(rh));
fft_input=fft(data);
fft_output=fft(filteredData);
plot(abs(fft_input));
plot(abs(fft_output));