# [R] 'subscript out of bounds' in matrices

Ben Bolker ben at zoo.ufl.edu
Mon Nov 12 11:01:54 CET 2001

```  Can you give us just a little bit more detail, or an example (with
simulated data if necessary) that recreates your problem?  I'm a little
bit confused: if p is a 2x1 matrix (dim(p)==c(2,1)), then your diag()
command below should give a 2x2 matrix.  Also, from just the detail you've
given it's hard to see how n could make any difference at all.  Is it
possible that for some value of n you're getting an empty matrix which is
triggering the error?

Ben Bolker

On Mon, 12 Nov 2001, Laura Gross wrote:

> Dear list
>
> Having read through all the archives of the mailing lists, I've had no
> luck finding the answer to my problem.
>
> I am running a for(i in 1:n) loop and am creating a matrix, p, for each
> of the n observations. This matrix p is a 2x1 matrix. I am then doing
> the following:
>
> diagp<-diag(c(p[1,1],p[2,1]))
>
> to create a matrix with the elements of P on the diagonal (i.e. a 4x4
> matrix).
>
> This works fine when I have n=60, however when I increase the size of
> the data set to n=100, I get the error message:
>
> Error in diag(c(p[1, 1], p[2, 1])) : subscript out of bounds
>
> I put this down to a problem with memory at first so increased the
> memory in my PC from 128Mb to 256Mb yet it made no difference and the
> error still occurred. I am eventually going to need to run this command
> for n=8000.
>
> Could anybody suggest what I can do to solve this problem? Do I need to
> store my matrix as another type of variable?
>
> Thanks in advance for any help
> Laura
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