CODEWITHSUNDEEP
pythonnumpymatrixminimum
Sage
Sage

Reputation: 53

Minimum element from the matrix column

I need to find minimum over all elements from the column which has the maximum column sum. I do the following things:

Create random matrix

from numpy import *
a = random.rand(5,4)

Then calculate sum of each column and find index of the maximum element

c = a.sum(axis=0)
d = argmax(c)

Then I try to find the minimum number in this column, but I am quite bad with syntax, I know how to find the minimum element in the row with current index.

e = min(a[d])

But how can I change it for columns?

Upvotes: 1

Views: 4327

Answers (1)

Richard
Richard

Reputation: 61289

You can extract the minimum value of a column as follows (using the variables you have indicated):

e=a[:,d].min()

Note that using

a=min(a[:,d])

will break you out of Numpy, slowing things down (thanks for pointing this out @SaulloCastro).

Upvotes: 5

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