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

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:

Answer 1

[dpb]

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.