[R] Plotting Multiple lines on one plot

[hadley wickham]

The easiest way to do with this ggplot2 is to melt your data first:

dfm <- melt(df, id = "date", measure = c("theta","vega","delta"))
qplot(date, value, data=dfm, geom="line", colour = variable)

Hadley

On Tue, Jul 22, 2008 at 6:05 PM, R_Learner <sschiang8 at gmail.com> wrote:
>
> Hi,
>  I'm trying to plot multiple lines on one plot. I have a data frame raw,
> and i want to plot raw$date on the x-axis and raw$theta, raw$vega,
> raw$delta, and a few others on the y-axis, with a legend. However, I'm not
> sure what the scale of those data sets are, and I don't know which one will
> have the largest scale. How can I plot this? I've tried ggplot (qplot), but
> it doesn't seem to be capable of multiple lines.
>
> Thanks!
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