ndarray.set the i, j vector about ndarray HOT 4 OPEN

I think there is no way to do it since the underlying data might not be contiguous in your newVector. Except some cases only you know about, there are no more efficient ways than the one you showed.

from ndarray.

I have the same requirement. I need to copy a subset of an ndarray into a different bigger ndarray as efficiently as possible. I think this can be implemented faster than the for loop above by using the compilation techniques that ndarray uses.

from ndarray.

You can use ndarray ops to do this, or for your median filter it might be faster to use cwise.

from ndarray.

Ah, right! I didn't see that, it's under "Special cases". So, it's:

ops.assign(dest, src) copies one array into another

Meaning you slice your source and destination arrays properly and then do assign().

This issue can be closed then.

from ndarray.