Asked by James Sheldon
on 12 Jun 2018 at 17:36

I put 5 txt files into a loop to graph the FFT and PDS continuously. They are audio files converted to txt files. I used "findpeaks" to find all peaks in the graphs. I then used "max" to find the max peak in each of the 5 graphs. I got 5 answers for the same variable. (l=max(v)). How do I plot all of these answers in one graph? Below is an example of my work. Here is the values I received for the max for each graph, l = 7.1537e+08, l = 1.3054e+09, l = 2.4736e+09, l = 3.4960e+09, l = 2.4039e+09

numfiles = 5; y = cell(1, numfiles); for k = 1:numfiles myfilename = sprintf('file%d.txt', k); y{k} = importdata(myfilename); plot(y{k}) m=(abs(fft(y{k}))); %n=m(1:y{k}/2); %plot(n); pwelch(y{k}) v= pwelch(y{k}) plot(v) xlim([0 4000]) findpeaks(v) l= max(v) end

Answer by Arun Mathamkode
on 15 Jun 2018 at 5:47

I believe you want to plot the maximum value for each graph against the index file. You can simply store maximum values in `l` as an array and plot the array.

In the loop, change `l=max(v)` to `l(k)=max(v)` and use `plot(l)` after the loop.

James Sheldon
on 20 Jun 2018 at 18:49

James Sheldon
on 20 Jun 2018 at 18:56

I want more of a scatter plot of the data so I can compare the results.

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Answer by James Sheldon
on 19 Jun 2018 at 12:23

Okay. I will try that and see how it turns out. Thank you.

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## 2 Comments

## Matt Dickson (view profile)

Direct link to this comment:https://www.mathworks.com/matlabcentral/answers/405321-how-to-plot-multiple-values-of-a-variable-in-one-graph#comment_577960

To clarify, you want to plot the maximum value (you call it l). What are you plotting it against? Index of the file?

## James Sheldon (view profile)

Direct link to this comment:https://www.mathworks.com/matlabcentral/answers/405321-how-to-plot-multiple-values-of-a-variable-in-one-graph#comment_577980

yes

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