[SciPy-user] How to use argmax ?
LB
berthe.loic@gmail....
Mon Oct 22 13:00:18 CDT 2007
Hi,
Let's say we have an array a :
If a is 1D, we have :
>>> a = array([1, 2, 5, 6,3, 4])
>>> ind = a.argmax()
>>> a[ind]
6
>>> a[ind] == a.max()
True
but if a is 2D (or more) :
a = array([[10,50,30],[60,20,40]])
I can know where the maxima are with the argmax function :
ind = a.argmax(axis=0)
>>> a
array([[10, 50, 30],
[60, 20, 40]])
>>> ind
array([1, 0, 1])
But what if a is 2D or more :
>>> a = array([[10, 20, 14], [60, 5, 7]])
>>> ind = a.argmax(axis=0)
>>> a
array([[10, 20, 14],
[60, 5, 7]])
>>> ind
array([1, 0, 0])
>>> a[ind]
array([[60, 5, 7],
[10, 20, 14],
[10, 20, 14]])
>>> a.max(axis=0)
array([60, 20, 14])
How can I combine a and ind to access to the max ?
--
LB
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