R help - Aug 2009 - if confusion

Simple question:

Why doesn't the following work? Or what 'R' rule am I missing?

tclass <-  "Testing 1 2 3"
if(tclass == "Testing 1 2 3")
{
    cat("Testing", tclass, "\n")
}
else
{
    cat(tclass, "\n")
}

I get an error 'else' is unexpected.

Thank you.

Kevin

Because the line if... Is syntactically complete. Move the else statement to the
line above it like

tclass <- "Testing 1 2 3"
if ( tclass == "Testing 1 2 3" )
{
    cat ( "Testing" , tclass , "\n" )
} else
{
    cat ( tclass , "\n" )
}

david


--
 David
?
 -----------------------------------------------------
 David Huffer, Ph.D.               Senior Statistician
 CSOSA/Washington, DC           david.huffer at csosa.gov
 -----------------------------------------------------



-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of rkevinburton at charter.net
Sent: Monday, August 03, 2009 4:41 PM
To: r-help at r-project.org
Subject: [R] if confusion

Simple question:

Why doesn't the following work? Or what 'R' rule am I missing?

tclass <-  "Testing 1 2 3"
if(tclass == "Testing 1 2 3")
{
    cat("Testing", tclass, "\n")
}
else
{
    cat(tclass, "\n")
}

I get an error 'else' is unexpected.

Thank you.

Kevin

______________________________________________
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.

This is because you could imagine a program like the following:

tclass <-  "Testing 1 2 3"
if(tclass == "Testing 1 2 3")
{
    cat("Testing", tclass, "\n")
}

cat("more stuff")

However, in your program, the next line is "else", which is not a
command you can just put in the middle of your program.

The solution is :

tclass <-  "Testing 1 2 3"
if(tclass == "Testing 1 2 3")
{
    cat("Testing", tclass, "\n")
} else {
    cat(tclass, "\n")
}

Erik 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of rkevinburton at charter.net
Sent: Monday, August 03, 2009 3:41 PM
To: r-help at r-project.org
Subject: [R] if confusion

Simple question:

Why doesn't the following work? Or what 'R' rule am I missing?

tclass <-  "Testing 1 2 3"
if(tclass == "Testing 1 2 3")
{
    cat("Testing", tclass, "\n")
}
else
{
    cat(tclass, "\n")
}

I get an error 'else' is unexpected.

Thank you.

Kevin

______________________________________________
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.

On 4/08/2009, at 8:40 AM, rkevinburton at charter.net wrote:
> Simple question:
>
> Why doesn't the following work? Or what 'R' rule am I missing?
>
> tclass <-  "Testing 1 2 3"
> if(tclass == "Testing 1 2 3")
> {
>     cat("Testing", tclass, "\n")
> }
> else
> {
>     cat(tclass, "\n")
> }
>
> I get an error 'else' is unexpected.
The segment

if(tclass == "Testing 1 2 3")
{
     cat("Testing", tclass, "\n")
}

Is syntactically complete, so that when the parser comes to the  
``else'' it
finds it ``dangling'' and hence ``unexpected''.

The following wee adjustment works:

tclass <-  "Testing 1 2 3"
if(tclass == "Testing 1 2 3")
{
     cat("Testing", tclass, "\n")
} else {
     cat(tclass, "\n")
}

	cheers,

		Rolf Turner

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