[Numpy-discussion] Find the N maximum values and corresponding indexes in an array
David Warde-Farley
dwf at cs.toronto.edu
Wed Dec 2 19:15:25 EST 2009
On 2-Dec-09, at 6:55 PM, Howard Chong wrote:
> def myFindMaxA(myList):
> """implement finding maximum value with for loop iteration"""
> maxIndex=0
> maxVal=myList[0]
> for index, item in enumerate(myList):
> if item[0]>maxVal:
> maxVal=item[0]
> maxIndex=index
> return [maxIndex, maxVal]
>
>
>
> My question is: how can I make the latter version run faster? I
> think the
> answer is that I have to do the iteration in C.
def find_biggest_n(myarray, n):
ind = np.argsort(myarray)
return ind[-n:], myarray[ind[-n:]]
David
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