R - obscure ggplot2 error:

Asked Apr 19 '15 at 20:11

Active Apr 19 '15 at 22:31

Viewed 143 times

I have created a grouped data frame using dplyr:

average_steps.i2 <- activity2 %>% 
   group_by(Group, interval) %>%
   summarise(Average.Steps = mean(steps))

when I attempt to plot it, using ggplot

ggplot(average_steps.i2 , aes(x=date,y=Average.Steps)) + 
      geom_line() +
      facet_wrap(~Group , nrow=2)

I get the following error:

Don't know how to automatically pick scale for object of type function. Defaulting to continuous
Error in data.frame(x = function ()  : 
  arguments imply differing number of rows: 0, 576

What does this mean? (I can program around by creating separate data sets and using par() to stack them, but would like to know the ggplot way to do this)

edited Apr 19 '15 at 22:31

Sandy Muspratt

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asked Apr 19 '15 at 20:11

Bill Raynor

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There is no column `date` in your `average_steps.i2` data.frame. – LyzandeR Apr 19 '15 at 23:29
@user3674944: Could you provide your dataset or did the comment by LyzandeR solve your problem? – Ruthger Righart Apr 20 '15 at 07:30
Thanks. I'm on the road, but that looks like it. – Bill Raynor Apr 21 '15 at 01:09

R - obscure ggplot2 error:

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