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ecomodeller avatar ecomodeller commented on September 17, 2024

I think we should try to mimic the functionality of xarray http://xarray.pydata.org/en/stable/generated/xarray.Dataset.sel.html

Since we are not loading the data lazily (yet, at least) the filtering is most efficient to do while reading the data and not on the Dataset, but this should still be possible, for convenience.

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ecomodeller avatar ecomodeller commented on September 17, 2024 
Python 3.7.4 (default, Aug  9 2019, 18:34:13) [MSC v.1915 64 bit (AMD64)] :: Anaconda, Inc. on win32

>>> import mikeio
>>> ds = mikeio.read("tests/testdata/HD2D.dfsu")
>>> ds
DataSet(data, time, items)
Number of items: 4
Shape: (9, 884)
1985-08-06 07:00:00 - 1985-08-07 03:00:00
>>> ds.items
[Surface elevation <Surface Elevation> (meter), U velocity <u velocity component> (meter per sec), V velocity <v velocity component> (meter per sec), Current speed <Current Speed> (meter per sec)]
>>> ds2 = ds[['Surface elevation','Current speed']] # item selection
>>> ds2.items
[Surface elevation <Surface Elevation> (meter), Current speed <Current Speed> (meter per sec)]
>>> len(ds2)
2
>>> ds3 = ds2.isel([0,1,2], axis=0) # temporal selection
>>> ds3
DataSet(data, time, items)
Number of items: 2
Shape: (3, 884)
1985-08-06 07:00:00 - 1985-08-06 12:00:00
>>> ds4 = ds3.isel([100,200], axis=1) # element selection
>>> ds4
DataSet(data, time, items)
Number of items: 2
Shape: (3, 2)
1985-08-06 07:00:00 - 1985-08-06 12:00:00
>>>

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jsmariegaard avatar jsmariegaard commented on September 17, 2024

Nice!

Another thing came to my mind: 3d dfsu files (and their Dataset) have a z-item which is node-based. When I do

ds3.isel([100], axis=1)

I will select node 100 for the z-item and element 100 for remaining items... that is not optimal. But I guess it is not very elegant to let the Dataset hold the element_table as well so it can look up which nodes are related to element 100 ???

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ecomodeller avatar ecomodeller commented on September 17, 2024

I think the dataset should eventually, know what type of geometry is represents, but I think that is for another day.

Should we skip z-item for now, to avoid confusion and a very likely IndexError?

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