array subset could be improved? -repost ;)
Hi all I have an array a=array([2,3,-1]). I want to extract an array with all the elements of a that are less than 0. Method 1. new = array([i for i in a if i < 0]) Method 2. new = a[nonzero(a<0)] I'm using Numeric arrays but can't seem to find a function that does this. Am I missing a more obvious way to do it quickly? Thanks Jim -- http://mail.python.org/mailman/listinfo/python-list
Re: array subset could be improved? -repost ;)
Jim O'D wrote: > Hi all > > I have an array a=array([2,3,-1]). > > I want to extract an array with all the elements of a that are less than 0. > > Method 1. > new = array([i for i in a if i < 0]) > > Method 2. > new = a[nonzero(a<0)] > > I'm using Numeric arrays but can't seem to find a function that does this. > > Am I missing a more obvious way to do it quickly? > > Thanks > > Jim -- http://mail.python.org/mailman/listinfo/python-list
Re: array subset could be improved? -repost ;)
Jim O'D wrote: > Hi all > > I have an array a=array([2,3,-1]). > > I want to extract an array with all the elements of a that are less than 0. > > Method 1. > new = array([i for i in a if i < 0]) > > Method 2. > new = a[nonzero(a<0)] > > I'm using Numeric arrays but can't seem to find a function that does this. > > Am I missing a more obvious way to do it quickly? > > Thanks > > Jim a2=Numeric.compress(a<0,a) -- http://mail.python.org/mailman/listinfo/python-list
Re: array subset could be improved? -repost ;)
Jim O'D wrote: > Hi all > > I have an array a=array([2,3,-1]). > > I want to extract an array with all the elements of a that are less than 0. Numeric is currently changing into the new scipy core. If you are willing to play with beta code, get it here: http://numeric.scipy.org if not, wait a little for an official release. With the new numeric, you'll be able to do: negatives = a[a<0] Cheers, f -- http://mail.python.org/mailman/listinfo/python-list
Re: array subset could be improved? -repost ;)
> With the new numeric, you'll be able to do: > > negatives = a[a<0] > > Cheers, > > f > Ooh, that's nice. Jim -- http://mail.python.org/mailman/listinfo/python-list
