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

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 at 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 ? 23:14:21 UTC+2, Rui Barradas

<ruipbarradas at sapo.pt>

a ?crit :





Hello,

Inline.

?s 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 ? 21:59:07 UTC+2, Richard M. Heiberger <

rmh at temple.edu> a ?crit :

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 at 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)
########################################

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