R help - Oct 2011 - Problem executing function

Hello All,

I have a series of steps that needs to be run many times. Hence I put them
all into a function. There is no problem in function creation, but when I
call the function, the steps are not getting executed or only the first step
gets executed. What possibly could be the reason?

Sample Function and the result:

fun <-  function ()
{
 # Package load into R;
a <-  c(library("RODBC"),library("e1071"));
b <- read.csv("Path of the csv file",
header=TRUE,sep=",",quote="");
c <- b[,1];
d <- b[,2];
e <- b[,3];
rm(b);    
 # Establishing ODBC connection;
conn <- odbcConnect(c,uid=d,pwd=e);
}
 
fun()

Warning messages:
1: package 'RODBC' was built under R version 2.13.1
2: package 'e1071' was built under R version 2.13.1

The subsequent csv fetch and odbc connection establishment are not getting
executed. Why is the function not getting executed fully? Even if I create a
separate function for csv file fetch, it is not being executed. But if I
simply type on the command prompt directly b <- read.csv("Path of the
csv
file",   header=TRUE, sep=",",quote=""); it is working.
Why is it like this?
I am not able to figure out the mistake.

Any help will be much useful. Have been struggling with this for quite some
time now.

Thanks
Divya 

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Sounds like what you were hoping for does happen in the function environment but
isn't returned to the global environment. The "proper" fix is to
put the values in a list and return() them as the function output.

Michael

On Oct 11, 2011, at 9:21 AM, Divyam <divyamurali13 at gmail.com> wrote:
> Hello All,
> 
> I have a series of steps that needs to be run many times. Hence I put them
> all into a function. There is no problem in function creation, but when I
> call the function, the steps are not getting executed or only the first
step
> gets executed. What possibly could be the reason?
> 
> Sample Function and the result:
> 
> fun <-  function ()
> {
> # Package load into R;
> a <-  c(library("RODBC"),library("e1071"));
> b <- read.csv("Path of the csv file",
header=TRUE,sep=",",quote="");
> c <- b[,1];
> d <- b[,2];
> e <- b[,3];
> rm(b);    
> # Establishing ODBC connection;
> conn <- odbcConnect(c,uid=d,pwd=e);
> }
> 
> fun()
> 
> Warning messages:
> 1: package 'RODBC' was built under R version 2.13.1
> 2: package 'e1071' was built under R version 2.13.1
> 
> The subsequent csv fetch and odbc connection establishment are not getting
> executed. Why is the function not getting executed fully? Even if I create
a
> separate function for csv file fetch, it is not being executed. But if I
> simply type on the command prompt directly b <- read.csv("Path of
the csv
> file",   header=TRUE, sep=",",quote=""); it is
working. Why is it like this?
> I am not able to figure out the mistake.
> 
> Any help will be much useful. Have been struggling with this for quite some
> time now.
> 
> Thanks
> Divya 
> 
> --
> View this message in context:
http://r.789695.n4.nabble.com/Problem-executing-function-tp3894359p3894359.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
> 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.

Hi Michael,

Thanks for the reply, but still the problem exists. When I list the objects
and return the result, they get printed on the console but the objects do
not get created. I am really baffled and clueless as to what the problem is. 

Divya

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show the work you did.  what is happening, probably, is that you are returning
the values, but not assigning them.

Sent from my iPad

On Oct 12, 2011, at 3:47, Divyam <divyamurali13 at gmail.com> wrote:
> Hi Michael,
> 
> Thanks for the reply, but still the problem exists. When I list the objects
> and return the result, they get printed on the console but the objects do
> not get created. I am really baffled and clueless as to what the problem
is.
> 
> Divya
> 
> --
> View this message in context:
http://r.789695.n4.nabble.com/Problem-executing-function-tp3894359p3897092.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
> 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.

> 
> Hi Michael,
> 
> Thanks for the reply, but still the problem exists. When I list the 
objects
> and return the result, they get printed on the console but the objects 
do
> not get created. I am really baffled and clueless as to what the problem 
is. 

I bet you do not understand basic operations in R. See chapter 2.1 in 
R-Intro manual coming with you R installation.

Object any.object does not exist untill you create it or assign a value to 
it.

x <- 1:10
y <- x*5+10+rnorm(10)
any.object <- lm(y~x)

Regards
Petr

> 
> Divya
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/Problem-
> executing-function-tp3894359p3897092.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
> 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.