R devel - Oct 2006 - Error: subscript out of bounds (PR#9305)

Full_Name: Steven King
Version: 1.16
OS: OSX vesion 10.4.8
Submission from: (NULL) (71.126.161.149)



Setting a matrix is a function - the failure occurs only on 2 X 2 matrices.

x<-matrix(1:4,nrow=2)
> x
     [,1] [,2]
[1,]    1    3
[2,]    2    4
> x[x]<-2
Error: subscript out of bounds

See ?"[" and note in particular

"A third form of indexing is via a numeric matrix with the one column
for each dimension: each row of the index matrix then selects a single
element of the array, and the result is a vector."

Thus the result in this case should be a vector with element 1,3 as its first
component and element 2,4 as its second.  Of course since x is 2x2
neither of these exist.

Thus its behaving correctly.

On 10/18/06, salking at verizon.net <salking at verizon.net>
wrote:
> Full_Name: Steven King
> Version: 1.16
> OS: OSX vesion 10.4.8
> Submission from: (NULL) (71.126.161.149)
>
>
>
> Setting a matrix is a function - the failure occurs only on 2 X 2 matrices.
>
> x<-matrix(1:4,nrow=2)
> > x
>     [,1] [,2]
> [1,]    1    3
> [2,]    2    4
> > x[x]<-2
> Error: subscript out of bounds
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

Why do you consider this to be a bug: you are using matrix indexing, and 
there is no element c(1,3) of x?

This form of indexing is covered in 'An Introduction to R'.


On Thu, 19 Oct 2006, salking at verizon.net wrote:
> Full_Name: Steven King
> Version: 1.16
There is no such version of R.
> OS: OSX vesion 10.4.8
> Submission from: (NULL) (71.126.161.149)
>
>
>
> Setting a matrix is a function - the failure occurs only on 2 X 2 matrices.
>
> x<-matrix(1:4,nrow=2)
>> x
>     [,1] [,2]
> [1,]    1    3
> [2,]    2    4
>> x[x]<-2
> Error: subscript out of bounds
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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