Search for values of a specific point of the signal

Hello

I would like to find several values of a signal at a given time.

For example, I am looking for the peak value of a signal and I type [peaks, locs] and it detects the peak and the time, but I would like to know the value for example 50ms before and 100 ms before.

Could you help me with this?

Thank you very much

[Mathieu NOE]

please share your code and data

[Julio]

Hi Mathieu, I've finally solved

Thanks for your interest