[R] conditional data replace (recode, change or whatsoever)

[zcatav]

Your suggestion works perfect as i pointed previous message. Now have another
question about data editing. I try this code:
X[X[,"c"]==1,"b"]<-X[,"d"]
and results with error: `[<-.data.frame`(`*tmp*`, X[, "c"] == 1, "b", value
= c(NA,  : 
  replacement has 9 rows, data has 2

Logically i selected 2 rows with X[,"c"]==1. Than i want to replace in that
rows its own data from "d" to "b" with X[,"b"]<-X[,"d"]. What is wrong?

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