I am running R version 2.15.1 in Windows XP
I am having problems with a function I'm trying to create to:
1. subset a data.frame based on function arguments (colname & parmname)
2. rename the PARMVALUE column in the data.frame based on function
argument (xvar)
3. generate charts
plotvar <- function(parentdf,colname, parmname,xvar,yvar ){
subdf <- parentdf[substr(colname,1,nchar(parmname)) == parmname,]
names(subdf) <- sub('PARMVALUE',xvar, names(subdf))
xvarcol <- paste("subdf","$",xvar,sep="")
yvarcol <- paste("subdf","$",yvar,sep="")
hist(eval(parse(text = xvarcol)), xlab = xvar, main = paste
("Distribution of ",xvar,sep=""))
boxplot(eval(parse(text = yvar))~HMA, ylab=yvar, xlab="HMA",
data=subdf)
plot(eval(parse(text = yvarcol))~eval(parse(text = xvarcol)), main =
paste(yvar," by ",xvar, sep=""), xlab = xvar, ylab = yvar)
scatterplot(eval(parse(text = yvar))~eval(parse(text = xvar)),
boxplots='xy', data=subdf, main = "Testcase_ID=142")
}
When I execute the function:
plotvar(mydf,mydf$PARMNAME, "C_2TAMP","Amp_2T","C1")
everything seems to work until the scatterplot statement. It posts this
error:
Error in parse(text = yvar) : object 'yvar' not found
However, when I insert browser() statement before the scatterplot
statement:
Browse[1]> ls()
[1] "colname" "parentdf" "parmname" "subdf" "xvar" "xvarcol"
"yvar" "yvarcol"
yvar is there, and the value is as expected
Browse[1]> yvar
[1] "C1"
Is this a quirk peculiar to scatterplot? (Note that boxplot which has
similar usage worked.)
I would appreciate any suggestions for how to resolve this, including a
different (better) approach. mydf can have many different parameters
(parmnames), so I am trying to come up with a generalized function to plot
the data.
Regards,
**************** Elaine McGovern Jones ************************
[email protected]
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