# How to use findpeaks function to give me the peak maxima within a particular length of time? How to find slopes of peaks?

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Zuha Yousuf 2019 年 10 月 23 日

I have a plot of data (voltage on y axis, time in miliseconds on x axis). I want to look at the positive peaks on my data within the first 20 miliseconds. How can I use the findpeaks function to constrain it to finding peaks within that time span, and how can I have it return the exact times of those peaks, rather than the indices?
An additional question is, how can I find the slopes of the peaks within this time span?
I'm attaching my plot below:

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### 回答 (1 件)

dpb 2019 年 10 月 24 日
The first Q? is you just pass the portion of the time series that encompasses whatever time span you wish -- how many points that is is dependent upon the sample rate -- N=T/dt
The second is described in the doc for findpeaks -- you can return the position of the peaks by passing the sample rate; the locations are converted to the units of the input based on that value.
The last I have no idea what a slope for a peak would be.

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