Possible Duplicate:
Replace contents of factor column in R dataframe
I have the data.frame
df1<-data.frame("Sp1"=1:6,"Sp2"=7:12,"Sp3"=13:18)
rownames(df1)=c("A","B","C","D","E","F")
df1
Sp1 Sp2 Sp3
A 1 7 13
B 2 8 14
C 3 9 15
D 4 10 16
E 5 11 17
F 6 12 18
I want to replace every entry of the number 8 in the column df1$Sp2 with the number 800. I have tried:
test<-replace(df1$Sp2,df1[800,"Sp2"],5)
e.g.:
df1$Sp2[df1$Sp2 == 8] <- 800
来源：https://stackoverflow.com/questions/11817371/replace-numbers-in-data-frame-column-in-r