R help - May 2010 - Apply: Output matrix orientation

Hi,

Why is the result of below "apply" call rotated with respect to the
input
and how to remedy this?

Thanks, Joh

.ZScore <- function(input){
  #cat(input,"\n")
  z <- (input - mean(input))/sd(input)
  return(z)
}

apply(data.frame(x1=c(1,2,3,4,5),x2=c(2,3,4,5,6),x3=c(3,4,5,6,7)),1,.ZScore)

Use aaply from the plyr package.

Hadley

On Thu, May 27, 2010 at 6:24 AM, Johannes Graumann
<johannes_graumann at web.de> wrote:
> Hi,
>
> Why is the result of below "apply" call rotated with respect to
the input
> and how to remedy this?
>
> Thanks, Joh
>
> .ZScore <- function(input){
> ?#cat(input,"\n")
> ?z <- (input - mean(input))/sd(input)
> ?return(z)
> }
>
>
apply(data.frame(x1=c(1,2,3,4,5),x2=c(2,3,4,5,6),x3=c(3,4,5,6,7)),1,.ZScore)
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>


-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/

On May 27, 2010, at 7:24 AM, Johannes Graumann wrote:
> Hi,
>
> Why is the result of below "apply" call rotated with respect to
the
> input
> and how to remedy this?
Because the processing you requested is with respect to rows and the  
construction of matrices is by default by columns.

?t

>
> Thanks, Joh
>
> .ZScore <- function(input){
>  #cat(input,"\n")
>  z <- (input - mean(input))/sd(input)
>  return(z)
> }
>
> apply(data.frame(x1=c(1,2,3,4,5),x2=c(2,3,4,5,6),x3=c(3,4,5,6,7)), 
> 1,.ZScore)
David Winsemius, MD
West Hartford, CT

David Winsemius wrote:
> 
> On May 27, 2010, at 7:24 AM, Johannes Graumann wrote:
> 
>> Hi,
>>
>> Why is the result of below "apply" call rotated with respect
to the
>> input
>> and how to remedy this?
> 
> Because the processing you requested is with respect to rows and the
> construction of matrices is by default by columns.
> 
> ?t
Thanks. t solved my problem without having to load another package.

Joh