# [Mne_analysis] Average evoked data in a certain time range

Mainak Jas mainakjas at gmail.com
Mon May 6 20:37:48 EDT 2019
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```        External Email - Use Caution

Hi Melvin,

I believe you can do this interactively in evoked.plot
<https://martinos.org/mne/dev/generated/mne.Evoked.html#mne.Evoked.plot>.
If you want to script this, the easiest solution might be to do the
averaging yourself by following these steps:

1. Crop the data to the desired time interval using evoked.crop
2. Average the resulting evoked.data using numpy
3. Use EvokedArray to create a new evoked instance from this average numpy
array
4. Use evoked.plot_topomap on this average.

Hope that helps,
Mainak

On Mon, May 6, 2019 at 9:18 AM Melvin Harsono <melvin_harsono at yahoo.com>
wrote:

>         External Email - Use Caution
>
> Dear MNE developers,
>
>
>
> I would like to ask if it is possible to average the evoked data in a
> certain time range? For example I would like to have a 2 seconds average
> (when t=1 to t=3) out of 4 seconds recording (t=0 to t=4) -> middle span
> averaging.
>
> My objective is to plot a topomap using evoked.plot_topomap in the 1-3
> seconds middle span average (the output is just a single topomap image as
> the result of averaging from the 1-3 seconds)
>
>
>
> Best regards,
>
> Melvin H.
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