Sahana,

The notation

df[a,b)]

is plain wrong.  I think you meant (but I may be mistaken)

df[a, b]

and I am not still sure if that would work in your example.   Have you
instead considered subset()?  E.g.,

subset(df, a <= 10 & b <= 10)

See ?subset for more details.

Also, "df" is a very bad name for your data.frame.  Check ?df to know why.

HTH,
Jorge.-



On Fri, Mar 22, 2013 at 10:34 PM, Sahana Srinivasan <> wrote:

> Hi everyone,
> I am trying to use the values from every cell of the data frame in a
> further calculation.
> This is the code that I am using to catch every element of the data-frame.
>
> while (a<=10)
> {
> while (b<=10)
> {
> n<-as.numeric(df[a,b)];
> ...;
> }
> }
>
> The problem is that when I print out 'n' I get the following errors :
> "NULL" (if printed without as.numeric), and "numeric(0)" if printed with
> the as.numeric.
>
> Again, if I use the same command without the loop, it gives the correct
> answer.
>
> Would be grateful for your inputs and ideas on this matter. Thanks in
> advance,
> Sahana.
>
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>
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