Re: ndarray slice in oct file

[David Bateman]

Daniel Oberhoff wrote:
> Hi,
>
> Can anyone tell me how to properly to slicing in oct-files?  
> Unfortunately the doxygen seems to be rather, well, undocumented :).  
> Right now I need a slice of an nd array to go into a matrix slice (or  
> an ndarray slice, doesn't matter), but matrix to matrix slicing would  
> be nice too. So stuff like:
>
> a(1:3,4:5) = b(2:4,1:2,3);
>
> but in an oct-file.
>
> Daniel
>
>   

There are no slicing methods in the NDArray classes, though maybe one
should be added. So you either have to do it by hand or convert the
above m-file code to an oct-file directly working on the octave_values..
This will be slow however. That is something like

Array<idx_vector> idx_vec (3);
NDArray b = args(0).array_value ();
idx_vec(0) = idx_vector (Range (2., 4.);
idx_vec(1) = idx_vector (Range (1., 2.);
idx_vec(2) = idx_vector (3.);
NDArray a = b.index (idx_vec);

D.

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David Bateman                                address@hidden
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