DataArray subset

[peendebak]

At the moment there is no functionality to make a subset of a DataSet or DataArray, e.g. if data have a DataSet with a 2D data array amplitude and setpoint arrays x, y one should be able to do

subdataset = dataset.subset('amplitude', 0:10, 0:30) 

assert(subdataset.x.size==10)
assert(subdataset.y.shape==(10, 30) )

Some questions

• Which notation do we want to use?
• Do we copy the metadata, or just create an empty metadata?

[AdriaanRol]

@peendebak I think this is indeed an important feature, to answer your qeustions.

1. I don't know what notation to use, also keep in mind that we may want this to support more abstract operations than just taking one array slicing it.
2. I'd say the metadata should be copied, potentially with the addition of referencing the original file and the commands used to subset it.