[R] problem with an IF statement?

Thomas Lumley tlumley at u.washington.edu
Thu Jul 28 18:30:22 CEST 2005

On Thu, 28 Jul 2005, tom wright wrote:

> Can somebody please take a look at this and tell me whats going wrong?
> It seems to be parsing wronly around the 'if' statement and gives me a
> directory listing.

I think the code that you posted is not quite the code you were 

The problem is that your code had tab characters in it.  The readline 
support in R interprets a tab character as a request to complete a file 
name.  If it can't do that unambiguously it will show the directory 
listing in response to a second tab.

Your email program has turned the tabs into spaces, which fixes the 
problem.  Your text editor probably has a way to do this.

Incidentally, this happens only on certain platforms, which is why the 
posting guide suggests you should say what system you are using.


> Thanks in advance
> Tom
> N.B. datan is an invented dataset
> xvals<-c(1,0.4,0.2)
> datan<-data.frame(s1=c(3,4,5),s2=c(5,5,5),s3=c(21,55,34),s4=c(5,3,2))
> datan$sint<-NA
> datan$sgrad<-NA
> for(icount in 1:dim(datan)[1]) {
> 	yvals<-c(datan[icount,4],datan[icount,3],datan[icount,2])
> 	if((is.na(yvals[1]) + is.na(yvals[2]) + is.na(yvals[3]))<2) {
> 		g<-lm(yvals~xvals)
> 		datan$sint[icount]<-g$coef[1]
> 		datan$sgrad[icount]<-g$coef[2]
> 	}
> }
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Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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