Hi John,
Here is my code practicing. Please give me some advises. Thank you.
Wu Gong
# Extract the function string
f.str <- sub("y~","",exprtext)
# Get arglist from the text
sp1 <- paste("\\",c(getGroupMembers(Arith),"(",")"),sep="")
sp2 <- getGroupMembers(Math)
sps <- paste(c(sp1,sp2),sep="",collapse="|")
agl <- gsub("^[0123456789]+$","",strsplit(f.str,sps)[[1]])
agl.u <- unique(agl[agl != "" & agl != "pi"])
# The command string making the function
c.str <- paste("f <- function(",paste(agl.u,sep="",collapse=", "),")
",f.str,sep="")
eval(parse(text=c.str))
f
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