I have a very large NumPy array
1 40 3
4 50 4
5 60 7
5 49 6
6 70 8
8 80 9
8 72 1
9 90 7
....
I want to check to see if a value exists in the 1st column of the array. I've got a bunch of homegrown ways (e.g. iterating through each row and checking), but given the size of the array I'd like to find the most efficient method.
Thanks!
How about
if value in my_array[:, col_num]:
do_whatever
Edit: I think __contains__
is implemented in such a way that this is the same as @detly's version