[R] Help with Sink Function

[Addi Wei]

iterations <- 100
nvars <- 4
combined <- rbind(scaleMiceTrain, scaleMiceTest)
reducedSample <- combined
reducedSample <- subset(reducedSample, select = -pID50)
reducedSample <- subset(reducedSample, select = -id)
for (i in 1:iterations)
{
	miceSample <- sample(combined[,-c(1,2)],nvars, replace=FALSE)

	miceSample$pID50 <- combined$pID50
	miceTestSample <- miceSample[47:55,]
	miceTrainSample <- miceSample[1:46,]


	fit.kknn <- kknn(pID50~., miceTrainSample, miceTestSample)
	table(miceTestSample$pID50, fit.kknn$fit)
	(fit.train1 <- train.kknn(pID50~., miceTrainSample, kmax=15,
kernel=c("rectangular"), distance=1))

	predictedTrain <- predict(fit.train1, miceTrainSample,
miceTrainSample$pID50)
	pID50Train <- miceTrainSample$pID50
	lmTrain <- lm(predictedTrain~pID50Train)
	slm <- summary(lmTrain)
	str(slm)
	if (i == 1) 
	{ 
		previousR2 <-slm$r.squared
		sink(file="R2outputKKNN.txt", append=TRUE)
		previousR2			
		sink() 
	}  
	else if(i!=1)
	{
		currentR2 <- slm$r.squared
		if (previousR2 > currentR2)
		{
			currentR2 <- previousR2		
		}	
		if (previousR2 < currentR2) 
		{
			sink(file="R2outputKKNN.txt", append=TRUE)
			currentR2
			sink()	
		}
	}
}


In my code above, I can't get sink to work.  In summary, I'm trying to write
the first run's R2, which is called "previousR2" to file, and then anytime
"currentR2" > "previousR2", I will write "currentR2" to file. After running
the code above, my file R2outputKKNN.txt is empty... 

However, just running the code below writes / works fine:  
previousR2 <-slm$r.squared
sink(file="R2outputKKNN.txt", append=TRUE)
previousR2			
sink() 
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