r - Recode a subset of column and row -

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i have data.frame , want recode specific column after selecting row value. data.frame this. first column id, second , third columns value use select specific rows, column 4 , above value store want recode.

i have store column name want recode in vector -> list1

df <- data.frame(letters[1:10],letters[1:2],letters[3:4],rep(0:1,each=5),rep(1:0,each=5),rep(1:0,each=5),rep(1:0,each=5))  names(df)<-c("sample","cond1","cond2","ge1","ge2","ge3","ge4") df  list1  <-  c("ge1","ge3")

what want get: when select cond1 == , cond2 == c can recode value of specific column (listed in vector) in case column ge1 , ge3.

a.e if conditions meet ge1 , ge3 recode na.

i have tried things : df$cond1[df$cond1 == "a" & df$cond2 =="c"] , many other fail!

you're wanting set conditional rows of specific columns na ?

df[df$cond1=="a" & df$cond2=="c", list1]  <- na

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