xarray Computation Practice#
Filtering or masking values#
worksheet? dimensions can still be awkward, even if they aren’t as bad in xarray as they are in numpy.
Getting a bunch of dates with .sel or .isel
Part 2#
Look again at the .max() documentation. We see that the dim argument can take either a single string or a sequence of strings. The sequence object we have used most is a List.
Try giving a list as an input to the .max() function to take the max over 2 dimensions of the array.
sst.max(dim=[‘lat’, ‘lon’]) sst.max(dim=[‘lat’, ‘time’]) sst.max(dim=[‘time’, ‘lon’])
stack/unstack also good for Part 2 homework https://docs.xarray.dev/en/stable/user-guide/reshaping.html#stack-and-unstack
Notice that the conditional doesn’t have to be data from the original dataset - it could be one of its coordinates, or even a totally different dataset of the same shape.
(from the lesson)
two dataset of the same shape, but where the conditional depends on another array. (A Dar group example?)
.rolling()?
https://docs.xarray.dev/en/latest/user-guide/groupby.html#apply using a custom .map() function for aggregation.