Hi, people.
I was a bit intrigued by the message quoted below. Indeed, if pt() is
given a matrix, it returns a matrix. Should this feature be documented?
?pt speaks about "a vector of quantiles", and says nothing about the
type of what it returns.
The same might presumably apply to other distribution-related functions.
----- Forwarded message from Martyn Plummer <[EMAIL PROTECTED]> -----
From: Martyn Plummer <[EMAIL PROTECTED]>
Date: Thu Apr 10 10:07:01 2003
Subject: [R] for loops and counters
Peter,
You didn't say what goes wrong, but you mind find this version more useful
tstat <- (matrix(means, k,k, byrow=TRUE) - matrix(means, k,k,byrow=FALSE))/rms
pvalue <- 2*(1-pt(abs(tstat), df=df))
pvalue[upper.tri(pvalue)]
S is designed to allow you to work with "whole objects", which means that
for loops can (and should) be avoided.
Martyn
On 05-Oct-99 Peter B. Mandeville wrote:
> I am trying to assign values to a vector (pvalue). Similar code works in C
> but not in R. What am I doing wrong?
> r <- pvalue <- 0
> for(i in (1:(k-1))){
> for(j in (i+1):k){
> r <- r+1
> tstat <- (means[i]-means[j])/rms
> pvalue[r] <- 2*(1-pt(abs(tstat),df))
> }
> }
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: [EMAIL PROTECTED]
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
----- End forwarded message -----
--
François Pinard http://pinard.progiciels-bpi.ca
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
