[R] Insert rows into a pre-existing data frame

[Mark Brewster]

Also, modified from Prof Brian Ripley's post 
https://stat.ethz.ch/pipermail/r-devel/2006-July/038551.html here ,

idx<- 2
df3<- df1[c(1:idx,idx,(idx+1):nrow(df1)),]
df3

df3[idx+1,]<- NA  #or whatever values you want
df3




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