How can I determine the x-value of a sudden change in y-values?

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Julia de Lange 2018-1-10

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评论： Star Strider 2018-1-11

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Screen Shot 2018-01-10 at 1.26.05 PM.png

I want to determine the start time and end time of that first impulse on the attached graph. I don't want to have to graph every dataset though (I have way too many) so would like to command matlab to do so from a two sets of values I've imported from excel. Does anyone have any suggestions? I'm very new to matlab.

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Star Strider 2018-1-10

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编辑：Star Strider 2018-1-10

It would help to have your data, and more detail about the features of your waveform you want to recover.

The findchangepts (link) or cusum (link) functions could be helpful.

EDIT — If you have R2017b or later, the ischange function and its friends may also work with your data.

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Julia de Lange 2018-1-11

This definitely help. Is there an easy way to just find the first major peak?

Star Strider 2018-1-11

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That depends on what you define as ‘major’. The name-value pair arguments can help you isolate the peaks you want.

To return only one peak, use the 'NPeaks' argument:

[pks,locs] = findpeaks(Voltage, 'MinPeakDist',2000, 'NPeaks',1);

Here, only the first peak value and its index will be returned.

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