R help - Sep 2008 - using for variable as rowname

Is there a way to use the cycle variable for rowname?

v=1:6
for (a in 1:3){
 for  (b in 4:5) {
  v=rbind(v,a.b=1)
 }
}
v

This above obviously does not work, but I couldn't find out how to use a and
b to construct a rowname like 14, 15, 24, 25.
Thanks for the help.
Balazs
-- 
View this message in context:
http://www.nabble.com/using-for-variable-as-rowname-tp19533203p19533203.html
Sent from the R help mailing list archive at Nabble.com.

> Is there a way to use the cycle variable for rowname?
> 
> v=1:6
> for (a in 1:3){
>  for  (b in 4:5) {
>   v=rbind(v,a.b=1)
>  }
> }
> v
> 
> This above obviously does not work, but I couldn't find out how to use
a
and
> b to construct a rowname like 14, 15, 24, 25.
Not pretty, but this does the trick.

v=1:6
nam <- "?"
for (a in 1:3){
   for  (b in 4:5) {
      v <- rbind(v,1)
      nam <- c(nam, paste(a,b,sep="."))
   }
}
rownames(v) <- nam
v

Regards,
Richie.

Mathematical Sciences Unit
HSL


------------------------------------------------------------------------
ATTENTION:

This message contains privileged and confidential inform...{{dropped:20}}

On 17-Sep-08 14:22:11, Ralikwen wrote:
> 
> Is there a way to use the cycle variable for rowname?
> 
> v=1:6
> for (a in 1:3){
>  for  (b in 4:5) {
>   v=rbind(v,a.b=1)
>  }
> }
> v
> 
> This above obviously does not work, but I couldn't find out how to use
> a and
> b to construct a rowname like 14, 15, 24, 25.
> Thanks for the help.
> Balazs
I don't know of a way to construct a paramater-name out of variable values
(so that "a.b" is a dynamic name as intended in your v=rbind(v,a.b=1)
),
though possibly someone else does!

However, something along the following lines would work (you construct
a vector of row names, along with v, within the loop, and then apply
it at the end):

  v<-(1:6)
  a.b<-"0"
  for (a in 1:3){
   for  (b in 4:5) {
    a.b<-c(a.b,paste(a,".",b,sep=""))
    v=rbind(v,1)
   }
  }
  rownames(v)<-a.b
  v
#     [,1] [,2] [,3] [,4] [,5] [,6]
# 0      1    2    3    4    5    6
# 1.4    1    1    1    1    1    1
# 1.5    1    1    1    1    1    1
# 2.4    1    1    1    1    1    1
# 2.5    1    1    1    1    1    1
# 3.4    1    1    1    1    1    1
# 3.5    1    1    1    1    1    1

Ted.

--------------------------------------------------------------------
E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
Fax-to-email: +44 (0)870 094 0861
Date: 17-Sep-08                                       Time: 16:02:18
------------------------------ XFMail ------------------------------

Thanks for your help,
I didn't know where you can or can't use a for variable.
Seems that I have to use rownames to do this anyway, so finally I went for a
more procedural solution:
v=1:6
for (a in 1:3){
   for  (b in 4:5) {
      v<-rbind(v,1+a+b:6+a+b)
      rownames(v)[nrow(v)]= paste(a,b,sep=".")
   }
}


Ralikwen wrote:
> 
> Is there a way to use the cycle variable for rowname?
> 
Thanks again.
Bal?zs
-- 
View this message in context:
http://www.nabble.com/using-for-variable-as-rowname-tp19533203p19549904.html
Sent from the R help mailing list archive at Nabble.com.