Dear All,
I have a data as follows:
ID <- 1:100
Y <- rnorm(100)
X <- rnorm(100)
type <- as.factor(rep(1:3,100,time=1))
df <- as.data.frame(cbind(ID, Y,X,type))
I want to plot Y versus X by specifying the pch to be as follows:
Subjects having type = 1 must be plotted with a character pch = "A"
Subjects having type = 2 must be plotted with a pch = "B"
Subjects having type = 3 must be plotted with a pch = 21
I used the follwomg:
df$pch_type = recode(df$type, "1 = 'A'; 2 = 'B'; else = '21' " )
plot(df$Y,df$X,pch= df$pch_type)
This plots subjects for type 1 and 2 with symbols A and B (this is what
expected) however subjects with type = 3 are plotted with a charcater 2 instead
of a pch=21. I understand that this is due to the fact that the created vector
"type_pch" cannot be a mixture between characters and numerics ... I tried to
use a list for that purpsoe but fail...
Any suggestions would be grateful,
Many thanks,
Bernard
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