[R] How to delete a date frame from a data frame

[Addi Wei]

e.g. I have a big data set called "combined", and then a small sample of
"combined" called "miceSample".  I wish to delete "miceSample" from
"combined" to create a new smaller data set and store it into a new object. 

combined <- rbind(scaleMiceTrain, scaleMiceTest)
miceSample <- sample(combined[,-c(1,2)],nvars, replace=FALSE)

How do I do that?  
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