dtype=&#39;<u27' when="" running="" python="" loop=""

Question

="" I'm running a for loop in python

for j in range(n):
    minJ = min(dataSet[:,j])

when I run this for minJ I'm getting

matrix([['-1']], dtype='<U27')

mydataset has rows like this: stringval stringval -1 0 1 -1 0 0 -1 -1 -1 -1

Any help would be great.

Thanks