Nahradiť hodnotu na s hodnotu z druhého stĺpca v r

Príklady kódu

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vymeňte všetky na dátový rámec, v r

a = data.frame(a=c(NA,1,2,NA), b=c(1,1,2,NA),c=c(NA,NA,2,NA))
for (i in 1:3){
  a[which(is.na(a[,i])),i] = 0
}

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