[R] discarding 'levels'

[hoopz]

Ok, so I am using read.table to read a .txt file and put it into a matrix. 
There are some values that are 'NA'.  If I use read.table with as.is =FALSE,
then some of the entries in the matrix return this:

> data[1,3]
[1]  0
Levels:  0  1  NA

and if I do 

> data[1,3]==0

it returns FALSE.  It's a zero, it's not false!


If I set as.is=TRUE, I don't get the levels problem, but in those entries
where I did get the levels problem, this happens:

> data[1,3]
[1] " 0"

This time, it keeps it as a string.  I can use as.numeric to fix it now, but
I'm just curious as to why this happens.


Thanks
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