Subset over multiple numerical columns in R -

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i have 3 columns of data, each numeric distance value.

i created subset each individual column eliminate outliers following function: 

newdata <- subset(x, x < mean(x)+3*sd(x) & x > mean(x)-3*sd(x))

the problem is, creates 3 new vectors different length, , run t-test on manipulated data.

how can best create subset of 3 columns data outside condition discarded?


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