Picking data from graph?

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Nurfaiz Fathurrahman 2021-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/1592424-picking-data-from-graph

评论： Nurfaiz Fathurrahman 2021-11-23

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?

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Walter Roberson 2021-11-22

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 ?

Nurfaiz Fathurrahman 2021-11-22

is it possible to retrieve data by picking in the graph? or use another method so that it can determine the start and end?

time range is fixed, signal is input using exsisting data

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采纳的回答

Bjorn Gustavsson 2021-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/1592424-picking-data-from-graph#answer_837304

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