R help - May 2002 - someProblem in R-1.4.1

Hi all,
This seems a very strange problem, but I'm running R-1.4.1 so, probably it
has been solved in the 1.5.0 version (unfortunatly I can  neither download
the new version nor see the archive).

Assignement of column names in a matrix, works just after editing it:
> M<-matrix(0,10,5)
>
dimnames(M)[[2]]<-c("a","m","m","m","m")
#say
Error: more elements supplied than there are to replace
> fix(M)
>
dimnames(M)[[2]]<-c("a","m","m","m","m")
#works
Furthermore the following problem also seems related:
nr<-20
M<-matrix(0,nr,5)
for(i in 1:nr){
            ........some functions.........
            M[i,]<-c(....) #5-dimensional vector
}
It works until to i=10 and then the following message appears:
Error in "[<-"(*tmp*, i, , value =c(......., :
            number of items to replace is not a multiple of replacement
length

This sound me very strange, because if some errors there are, it should not
work also for i<=10.
The loop perfectly works with nr=10 , but it doesn't so for nr=15, 30, for
instance.

Many thanks for your help
best,
vito


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On Wed, 22 May 2002, vito muggeo wrote:
> Hi all,
> This seems a very strange problem, but I'm running R-1.4.1 so, probably
it
> has been solved in the 1.5.0 version (unfortunatly I can  neither download
> the new version nor see the archive).
>
> Assignement of column names in a matrix, works just after editing it:
>
> > M<-matrix(0,10,5)
> >
dimnames(M)[[2]]<-c("a","m","m","m","m")
#say
> Error: more elements supplied than there are to replace
That's incorrect.  Try
> dimnames(M)
NULL

so you are trying to replace the second element of NULL.

colnames(M)<-c("a","m","m","m","m")
#say

will work, as will
dimnames(M) <- list(NULL,
c("a","m","m","m","m"))
> > fix(M)
That adds colnames, as it uses the internals of edit.data.frame.
> >
dimnames(M)[[2]]<-c("a","m","m","m","m")
#works
This is still the same in 1.5.0.


-- 
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)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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vito muggeo wrote:
> 
> Hi all,
> This seems a very strange problem, but I'm running R-1.4.1 so, probably
it
> has been solved in the 1.5.0 version (unfortunatly I can  neither download
> the new version nor see the archive).
> 
> Assignement of column names in a matrix, works just after editing it:
> 
> > M<-matrix(0,10,5)
> >
dimnames(M)[[2]]<-c("a","m","m","m","m")
#say
> Error: more elements supplied than there are to replace
> > fix(M)
> >
dimnames(M)[[2]]<-c("a","m","m","m","m")
#works

During fix()-ing  the matrix got column names, and dimnames() got a list
of two elements (it was not before!).
Please read ?dimnames. The *second* example is not documented to work.

You can always assign names as described on the help page:
   dimnames(M) <- list(NULL,
c("a","m","m","m","m"))

Or just use 
   colnames(M) <-
c("a","m","m","m","m")


 
> Furthermore the following problem also seems related:
> nr<-20
> M<-matrix(0,nr,5)
> for(i in 1:nr){
>             ........some functions.........
>             M[i,]<-c(....) #5-dimensional vector
> }
> It works until to i=10 and then the following message appears:
> Error in "[<-"(*tmp*, i, , value =c(......., :
>             number of items to replace is not a multiple of replacement
> length
 nr <- 20
 M <- matrix(0, nr, 5)
 for(i in 1:nr) M[i,] <- 1:5

works for me. Can you provide an example?

> This sound me very strange, because if some errors there are, it should not
> work also for i<=10.
> The loop perfectly works with nr=10 , but it doesn't so for nr=15, 30,
for
> instance.
> 
> Many thanks for your help
> best,
> vito
Uwe Ligges
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