使用python从数组中查找第4个最大元素

Question

I have an array in which i have element like a = array.array('i',[3,5,7,2,8,9,10,37,99]) . Now I have to find 4th largest element, If this is a list , then i can find by this way,

l = [3,5,7,2,8,9,10,37,99]
m = sorted(l)
m[-4]

Answer 1

you could use numpy.argsort that gives you the indices of the min values in order. So:

from numpy import argsort
index_to_fourth_largest_element = argsort(a)[-4]

But if you use this solution (meaning that you use numpy) and plan to do more with the array you could considering using numpy.array instead of array.array in the first place.