Narray question

Hello, I am having an issue with a large dataset I am using. My
problem is I try to convert from an array to Narray and it seems like
the size is changing.

To check this, in the middle of my script I wrote

puts f.size
puts count.size
puts count
x=NArray.to_na(count)
puts x.size

the results
900
900
[the numbers in a column]
1754

sorry, made a mistake in code.