[R] Error: subscript out of bounds.

[Patrick Burns]

There is a good reason for the error in the
matrix case.  Consider what would need to
happen for:

m[3, 5] <- 100

to work.

Consistency might be a good thing here, but
if so I think it should be an error for the 1-D
case.  This might be a useful difference between
1-D arrays and vectors.  However, it isn't clear
(to me at least) what such a change would break.


Patrick Burns
patrick at burns-stat.com
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")

Rolf Turner wrote:
>
> Consider:
>
>     > x <- array(1:12,dim=12)
>     > x[13]
>     [1] NA]
>     > m <- array(1:12,dim=c(3,4))
>     > m[3,5]
>     Error: subscript out of bounds
>
> Can anyone tell me it there is a Good Reason for the difference in 
> behaviour
> between 1 dimensional and higher dimensional arrays?  In a bit of code 
> that
> I was working on I expected the NA behaviour and didn't get it of 
> course.  Then
> I had to take evasive action to avoid the error.
>
> Naive young thing that I am, I would prefer the NA behaviour to be 
> universal.
> But I expect that, as usual, I'm overlooking something.
>
>     cheers,
>
>         Rolf Turner
>
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