How to re-combine values based on an index?

newdataset[testindex] = testset[testindex]
  object 'dataset' not found
Is that really what R printed?  I get
  > newdataset[testindex] = testset[testindex]
  Error in newdataset[testindex] = testset[testindex] : 
    object 'newdataset' not found
but perhaps you have a different problem.  Copy and paste
(and read) the error message you got.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
Of Brian Feeny
Sent: Saturday, December 01, 2012 8:04 PM
To: r-help at r-project.org
Subject: [R] How to re-combine values based on an index?

I am able to split my df into two like so:

dataset <- trainset
index <- 1:nrow(dataset)
testindex <- sample(index, trunc(length(index)*30/100))
trainset <- dataset[-testindex,]
testset <- dataset[testindex,-1]

So I have the index information, how could I re-combine the data using that back into a
single df?

I tried what I thought might work, but failed with:

newdataset[testindex] = testset[testindex]
  object 'dataset' not found
newdataset[-testindex] = trainset[-testindex]
  object 'dataset' not found

Brian

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How to re-combine values based on an index?

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