ggplot is looking for thisData as a column of coffs.  the most
'ggplotesque' way of doing this would be:

# melt your data to a "long" format:
coffs.melt <- melt(coffs, id.vars = 'levels')

# plot using colour aes parameter:
ggplot(coffs.melt, aes(x=levels, y=value, colour=variable)) + geom_line() +
ylab('Total Chargeoffs')

this is untested since there is no sample data!

Justin


On Thu, Feb 16, 2012 at 2:50 PM, Keith Weintraub <kw1958@gmail.com> wrote:

> Folks,
>  I want to automate some graphing using ggplot.
>
> Here is my code
> graphChargeOffs2<-function(coffs) {
>  ggplot(coffs, aes(levels))
>  dataNames<-names(coffs)[!names(coffs) == "levels"]
>  for(i in dataNames) {
>    thisData<-coffs[[i]]
>    last_plot() + geom_line(aes(y = thisData, colour = i))
>  }
>  last_plot() + ylab("Total Chargeoffs")
> }
>
> coffs is a data.frame.
>
> I get the following error:
> Error in eval(expr, envir, enclos) : object 'thisData' not found
>
> As little as I know about environments in R I am pretty sure that the
> geom_line in the loop is not able to see the thisData variable.
>
> Any help you could provide would be appreciated. I would be surprised if
> there wasn't a way to pass the data into the geom_line function without
> using environments. Of course I have been wrong once or twice in the past.
> :)
>
> Note that geom_line also can't see the input variable "coffs".
>
> Thanks for any and all heo
>
>
>
>
> --
>
>
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>
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