[R] Sampling problems

[Oritteropus]

Hi, thank you but it does work for vectors and matrix but not dataframes, it
gives me this message error:

MeanA <- read.csv("MeanAmf.csv",header=T)
mysample <- MeanA[sample(1:nrow(MeanA), 20, replace=FALSE),]
remainder<-MeanA[-mysample]
Error in `[.default`(MeanA, -mysample) : invalid subscript type 'list'
In Ops.factor(left) : - not meaningful for factors

Any other way?

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