R help - Feb 2010 - programing problem with for( )

Hi R-users

I'm writing a code to run a fuction but I found an error that I can't
fix. I
reproduced the error with a simple example.

The correct answer is k but I can't fill my s matrix. What I'm doing
wrong?


 s<-matrix(data=NA,nrow=1,ncol=5 )
 s

for(i in 1:5)
      {
      k=sqrt(i)
      s[,i]<-k[i]
   print(k)
      }

s

Thanks in advance,

Marlene.

	[[alternative HTML version deleted]]

Try this:

s <-matrix(data=NA,nrow=1,ncol=5 )
for( i in 1:5) {
   k <- sqrt(i)
   s[,i] <- k
   print(k)
}


Or:

s[] <- sqrt(1:5)



On Mon, Feb 1, 2010 at 9:29 AM, marlene marchena
<marchenamarlene at gmail.com> wrote:
> Hi R-users
>
> I'm writing a code to run a fuction but I found an error that I
can't fix. I
> reproduced the error with a simple example.
>
> The correct answer is k but I can't fill my s matrix. What I'm
doing wrong?
>
>
> ?s<-matrix(data=NA,nrow=1,ncol=5 )
> ?s
>
> for(i in 1:5)
> ? ? ?{
> ? ? ?k=sqrt(i)
> ? ? ?s[,i]<-k[i]
> ? print(k)
> ? ? ?}
>
> s
>
> Thanks in advance,
>
> Marlene.
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O

On 01-Feb-10 11:29:40, marlene marchena wrote:
> Hi R-users
> 
> I'm writing a code to run a fuction but I found an error that I
can't
> fix. I
> reproduced the error with a simple example.
> 
> The correct answer is k but I can't fill my s matrix. What I'm
doing
> wrong?
> 
> 
>  s<-matrix(data=NA,nrow=1,ncol=5 )
>  s
> 
> for(i in 1:5)
>       {
>       k=sqrt(i)
>       s[,i]<-k[i]
>    print(k)
>       }
> 
> s
> 
> Thanks in advance,
> Marlene.
Use s[,i]<-k instead of s[,i]<-k[i] since k=sqrt(i) assigns a
single value to k. Hence k[1] will be the same as k, but for
i>1 k[i] will always be NA.

A better way to do the whole thing (in your example) is simply

  s <- sqrt(1:5)

but your example may be a very simple case of a more complex
procedure!

Hoping this helps,
Ted.

--------------------------------------------------------------------
E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
Fax-to-email: +44 (0)870 094 0861
Date: 01-Feb-10                                       Time: 11:41:46
------------------------------ XFMail ------------------------------