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 > > You could use filter (which is planned to be removed in Py3000). E.g. "array(filter(lambda x: x < 0, (-1, 2, -4, 5, 55, 9, -73, 5)))"
I tend to like "array(i for i in (-1, 2, -4, 5, 55, 9, -73, 5) if i < 0)" better though. (And its even shorter). HTH, Peter -- http://mail.python.org/mailman/listinfo/python-list
