How to format numbers in xarray?

[ahuang11]

import xarray as xr
da = xr.DataArray([5., 6., 7.])
da = da.str.format("%.2f")

I want to do

da = xr.DataArray([f"{s:.2f}" for s in da])

[raybellwaves]

Is there a way to do it in numpy?

[andersy005]

@ahuang11, would this work for you?

In [9]: import xarray as xr

In [10]: da = xr.DataArray([5., 6., 7.])

In [11]: xr.DataArray([f"{s:.2f}" for s in da.data])
Out[11]: 
<xarray.DataArray (dim_0: 3)>
array(['5.00', '6.00', '7.00'], dtype='<U4')
Dimensions without coordinates: dim_0

[ahuang11]

Thanks that works, but I'm curious if there's a way to vectorize that rather than looping, and also how it works with more than one dimension.

[fmaussion]

@ahuang11 : https://xarray.pydata.org/en/stable/generated/xarray.DataArray.str.html

import xarray as xr

da = xr.DataArray([5., 6., 7.])
das = xr.DataArray("%.2f")
das.str % da

<xarray.DataArray (dim_0: 3)>
array(['5.00', '6.00', '7.00'], dtype='<U4')
Dimensions without coordinates: dim_0

[ahuang11]

Huh wow, that's awesome, but a strange syntax! I wonder if it's possible to implement a built-in function like:
da.str.format("%.2f") or xr.string_format(da, "%.2f)

Anyhow, thanks for sharing!