Picking data from graph?
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Nurfaiz Fathurrahman
on 22 Nov 2021
Commented: Nurfaiz Fathurrahman
on 23 Nov 2021
I have a sample signal below, I just want to retrieve the data in the red box for the next step of processing, how do I do it?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/808629/image.png)
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Walter Roberson
on 22 Nov 2021
How should the program know where to start extracting? How should the program know where to stop extracting ?
Is the time range fixed? Have the times been input by the user? Does the program need to detect the first minima and extract everything to the sixth minima ?
Accepted Answer
Bjorn Gustavsson
on 22 Nov 2021
If you have the signal S, the corresponding sample-times t and the start and stop-times t1 and t2 you can select the signal in the intervall:
S1to2 = S(t1<t&t<=t2);
If you want to select the time-interval from the graph, have a look at the help and documentation of ginput, it is a function that allows you to select points in graphs. You could use that to select 2 points (you will/can get bot the x and y-values of selected points) to give you t1 and t2.
HTH
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