It is indeed the fact you're plotting factors, but unless you say what
"as intended" is, it's hard to provide exactly what you're seeking.
Perhaps this will help though:
X <- factor(sample(letters[1:5], 15, TRUE))
Y <- rnorm(15)
dats <- data.frame(X, Y)
plot(Y ~ X, data = dats) # No good
plot(X ~ Y, data = dats) # Also probably not what you want
plot(Y ~ as.numeric(X), data = dats) # Good but ugly lables
plot(Y ~ as.numeric(X), data = dats, xaxt = "n", xlab = "X")
axis(1, at = seq_along(levels(X)), labels = levels(X)) # Good
But perhaps easier is
library(ggplot2)
qplot(X,Y, dats)
Michael
On Mon, Apr 23, 2012 at 11:25 AM, la mer <melissarosenkr...@gmail.com> wrote:
> Hello,
>
> I am having a problem where code that plots lines using a different data
> frame plots bars with the current data frame (I am intended to plot lines).
> The code specifies lines (see below), so I can't figure out why the results
> are bars. I suspect that it may have something to do with the fact that in
> the data frame where the code worked as intended, the both variables
> specifying different lines were numeric, whereas in the current data frame
> one of those variables (challenge) is a factor with 2 levels. Any
> suggestions for getting this to plot as intended would be much appreciated.
>
> Thank you!
>
> ************ This is meant to plot a separate line for each subject for each
> challenge*************
> for (subj in unique(lab.samples$subid)) {
> #par(new=T)
> plot.new()
> par(mfrow=c(2,1))
> par(mfg=c(1,1))
> plot(data=lab.samples, subset=(subid==subj), cortisol ~ Sample,
> type='n',
> main=paste('Cortisol and Amylase for subject ',
> as.character(subj)))
>
> for ( t in unique(subset(lab.samples,subid==subj)$challenge) ) {
> par(mfg=c(1,1))
> lines(data=lab.samples, subset=(subid==subj & challenge==t),
> cortisol ~ Sample, type='b', pch=as.character(t),
> col=rainbow(2)[t])
> }
> par(mfg=c(2,1))
> plot(data=lab.samples, subset=(subid==subj), amylase ~ Sample,
> type='n')
> for ( t in unique(subset(lab.samples,subid==subj)$challenge) ) {
> par(mfg=c(2,1))
> lines(data=lab.samples, subset=(subid==subj & challenge==t),
> amylase ~ Sample, type='b', pch=as.character(t),
> col=heat.colors(2)[t])
> }
> }
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/plot-function-creating-bars-instead-of-lines-tp4580765p4580765.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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