Counting rows given conditional

Hello,

I have an input file that contains multiple columns, but the column I'm
concerned about looks like:

"TR"
5
0
4
1
0
2
0

To count all of the rows in the column I know how to do NROW(x$TR) which
gives 7.

However, I would also like to count only the number of rows with values >=1
(i.e. not 0). I've tried NROW(x$TR>=1) which did not give the intended
output.

Do any of you have any suggestions as to where I'm going wrong?



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