r - Binding Replicate Rows to a Dataframe -


can improve on following code?

a  <- b <- c  <-  c(-1,1) # factorial design design  <- expand.grid(a=a, b=b,c=c) # factorial design design  <- rbind(design, c(0,0,0),c(0,0,0),c(0,0,0))  #  centre points added design

i want last line more succinct.

when tried rbind(design, matrix(0,3,3)) code crashed. col names matrix , design different causing problems. when tried rbind(design, rep(c(0,0,0),3)) got 1 row appended rather three.

this question kindly answered @lyzander above

rbind(design, 0, 0, 0)

which works recycling each of values each of rows.

hence,

a  <- b <- c  <-  c(-1,1) # factorial design design  <- expand.grid(a=a, b=b,c=c) # factorial design design  <- rbind(design,0,0,0)  #  centre points added design

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