[R] [External] Re: [External] Get a result but an error message as well ?

[Richard M. Heiberger]

you need to pay attention to the intermediate structures that you generate.
If all you want is one number, then that is what you should create

mean(replicate( 500, my.experiment() ))

Since you do seem to want to store the intermediate values, then you must
name
the object according to its structure.  A one-dimensional vector takes
names(), not dimnames().
A two-dimensional structure takes dimnames, and the number of row names and
the number of column
names must match the number of rows and columns.


On Tue, May 19, 2020 at 5:25 PM varin sacha <varinsacha using yahoo.fr> wrote:

> Hi Rui,
>
> If I don't transpose t() the output of the replicate (my R code here
> below) I still get an error message !!
>
> ########################################
> a=c(2,4,3,4,6,5,3,1,2,3,4,3,4,5,65)
> b=c(23,45,32,12,23,43,56,44,33,11,12,54,23,34,54)
> d=c(9,4,5,3,2,1,3,4,5,6,4,9,10,11,18)
>
> my.experiment <- function() {
>
> OLS <- lm( a ~ b+d )
>
> MSE_OLS<-mean(OLS$residuals^2)
>
> return( c(MSE_OLS) )
> }
>
> my.data = replicate( 500, my.experiment() )
> colnames(my.data) <- c("MSE_OLS")
> mean(my.data)
> ########################################
>
>
>
>
>
>
> Le mardi 19 mai 2020 à 23:14:21 UTC+2, Rui Barradas <ruipbarradas using sapo.pt>
> a écrit :
>
>
>
>
>
> Hello,
>
> Inline.
>
> Às 21:38 de 19/05/20, varin sacha via R-help escreveu:
> >
> > Hi Richard,
> >
> > Thanks for your response.
> > However, how can I correct my R code knowing that I want, as a result,
> only one value : the mean of the 500 MSE_OLS values ?
>
> Just don't transpose the output of replicate?
>
> Hope this helps,
>
> Rui Barradas
>
> >
> >
> >
> >
> >
> >
> >
> > Le mardi 19 mai 2020 à 21:59:07 UTC+2, Richard M. Heiberger <
> rmh using temple.edu> a écrit :
> >
> >
> >
> >
> >
> >> dim(my.data)
> > [1]   1 500
> >
> > you have a matrix with a single row and 500 columns.
> > you gave a name to only the first column.
> >
> > Look at the result of replicate().  it is a vector.  You transposed it
> into a one-row matrix.
> >
> >>   tmp <- replicate( 500, my.experiment() )
> >> dim(tmp)
> > NULL
> >> length(tmp)
> > [1] 500
> >> dim(t(tmp))
> > [1]   1 500
> >
> >
> > On Tue, May 19, 2020 at 3:51 PM varin sacha via R-help <
> r-help using r-project.org> wrote:
> >> Dear R-experts,
> >>
> >> Here is my R code, I get a result but I also get an error message so I
> doubt I can trust the result I get.
> >> What is going wrong ? Many thanks.
> >>
> >> ########################################
> >> a<-c(2,4,3,4,6,5,3,1,2,3,4,3,4,5,65)
> >> b<-c(23,45,32,12,23,43,56,44,33,11,12,54,23,34,54)
> >> d<-c(9,4,5,3,2,1,3,4,5,6,4,9,10,11,18)
> >>
> >> my.experiment <- function( ) {
> >>
> >> OLS <- lm( a ~ b+d )
> >> MSE_OLS<-mean(OLS$residuals^2)
> >> return( c(MSE_OLS) )
> >> }
> >>
> >> my.data = t(replicate( 500, my.experiment() ))
> >> colnames(my.data) <- c("MSE_OLS")
> >> mean(my.data)
> >> ########################################
> >>
> >>
> >> ______________________________________________
> >> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> >> https://stat.ethz.ch/mailman/listinfo/r-help
> >> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >>
> >
> > ______________________________________________
> > R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>

	[[alternative HTML version deleted]]