On Tue, Jan 19, 2010 at 9:00 AM, Robert Somerville < rsomervi...@sjgeophysics.com> wrote:
> Hi; > Hi, why did you post this three times? > i am having trouble trying to sort the rows of a 2 dimensional array by the > values in the first column .. does anybody know how or have an example of > how to do this ??? while leaving the remain columns remain relative to the > leading column > > from numpy import * > > a=array( [ [4, 4, 3], [4, 5, 2], [3, 1, 1] ] ) > > i would like to generate the output (or get the output ...) > > b = [ [3,1,1], [4,4,3], [4,5,2] ] > I don't use numpy, so this may or may not work. But for a regular python list-of-lists (2 dimensional array), you simply do: a.sort(key=lambda x: x[0]) --S
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