How can I only keep data in one xarray for entries that match a specific dimension in another xarray?

[benoitespinola]

I have two datasets:
ds1, with coordinates time, lat, lon, depth.
ds2, with coordinates time.

The time in ds1 has a higher resolution than ds2 and all the times in ds2 are present in ds1.

For instance:

ds1.time = [0, 1, 2 , 3, 4, 5, 6, 7, 8, 9 ,10]
ds2.time = [0, 5, 10]

(I am using int instead of datetime64 here for the readability)

I would like to drop all the entries in ds1 where the time is NOT in ds2.time so that I only keep the records in ds1 such as:
ds1.time = [0, 5, 10]

How can I do that?

I tried sel, isel, resample, where... All failed.

[keewis]

if I understand correctly, you should be able to do ds1.sel(time=ds2.time).

If that doesn't work, maybe your times are a little bit off? Try method="nearest" with a appropriate tolerance in that case.

Otherwise we'd need more information on your time variable and the code you tried.

[benoitespinola]

After a lot of research, trial and error, I got it to work as follow:

ds1 = ds1.where(ds1.time.isin(ds2.time), drop=True)