[ncl-talk] Fill Values in NCL and Python

[Karin Meier-Fleischer]

NCL:

     xsqrt = *where*(arr .gt. 0,*sqrt* 
<https://www.ncl.ucar.edu/Document/Functions/Built-in/sqrt.shtml>(arr), 
arr at _FillValue)

Python:

     xsqrt = np.where(arr > 0, np.sqrt(arr), np.nan)



Am 28.02.24 um 16:02 schrieb Karin Meier-Fleischer via ncl-talk:
> Hi Barry,
>
> the following two Python examples demonstrate how to set values in a 
> NumPy and an Xarray array to NaN using a condition.
>
> arr = np.arange(0., 10.)
> arr[arr >= 7.] = np.nan
> print(arr)
>
> -----> output: [ 0. 1. 2. 3. 4. 5. 6. nan nan nan]
>
> xarr = xr.DataArray(np.arange(10))
> xarr = xarr.where(xarr < 7, np.nan)
> print(xarr.values)
>
> -----> output: [ 0. 1. 2. 3. 4. 5. 6. nan nan nan]
>
> Regards,
> Karin
>
> Am 28.02.24 um 15:10 schrieb Barry Lynn via ncl-talk:
>> Hi:
>>
>> I know how to change an array value to fillvalue in NCL using a where 
>> statement.
>>
>> How do I do the same in python, please?
>>
>> Barry
>> -- 
>>
>> Barry H. Lynn, Ph.D
>> Senior Scientist, Lecturer,
>> The Institute of Earth Sciences,
>> The Hebrew University of Jerusalem,
>> Givat Ram, Jerusalem 91904, Israel
>> Tel: 972 547 231 170
>> Fax: (972)-25662581
>>
>> Weather It Is, LTD
>> Weather and Climate Focus
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>>
>>
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