Double FOR
Maybe you whould try:
One of your problems is that you are rewriting the resoults so that the
resoult you get is only for the final combination of m, s, y.
Secondly, I am not sure if you want to use in the equation elements of m, s,
y, or the whole vectors.
function (m,s,y)
{
DIC.hat<-NULL
for (j in m){
for (k in s){
for (i in y){
DIC.hat<-cbind(DIC.hat,c(m=j,s=k,y=i,DIC.hat=sum(-2*((log(1/sqrt(2*pi*k^2))*exp((((i-j)/k)^2)/-2)))))
}
}
}
DIC.hat
}
Best,
Ales Ziberna
----- Original Message -----
From: "Ginestet, Cedric" <c.ginestet at imperial.ac.uk>
To: <r-help at stat.math.ethz.ch>
Sent: Saturday, November 26, 2005 4:09 PM
Subject: [R] Double FOR
Hi,
I want to run through a formula several times with several different
variables (which are defined by independent vectors of equal length 10
elements). It looks like this:
function (m,s,y)
{
for (j in m){
for (k in s){
for (i in y){
DIC.hat<-sum(-2*((log(1/sqrt(2*pi*s^2))*exp((((y-m[j])/s)^2)/-2))))
}
}
}
DIC.hat
}
My problem is that R runs the three variables at the same time providing
me with 10 new elements for DIC.hat, when I would like to have 20 times
more.
Can you help?
----------------------------------------------------
Cedric Ginestet
Department of Epidemiology and Public Health
Faculty of Medicine
Imperial College
Norfolk Place
London
W2 1PG
UK
Tel: +44 (0)77 8688 4313
Fax: +44 (0)20 7402 2150
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