[R] ggplot - class "character" problem

Ista Zahn izahn at psych.rochester.edu
Tue Sep 13 15:08:09 CEST 2011

On Tue, Sep 13, 2011 at 7:32 AM, RCulloch <ross.culloch at dur.ac.uk> wrote:
> I suspect it is to do with your method of creating the dataframe,

I think the error is actually triggered by quoting the name of the
data.frame in the qplot call.

I would
> check to see if the columns in the df are numeric, which you can do by:
> is.numeric(flat_data$time)

Or just use str(flat_data)


> for each variable, if it is not numeric (and at least one must be a
> character, given the error message) then redefine as a numeric
> flat_data$time<-as.numeric(flat_data$time)
> I reckon people better versed in R will have a more efficient solution, but
> that should work......
> Ross
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Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology

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