[R] geom_errorbar() issue in ggplot2

[Thierry Onkelinx]

The limits are more narrow than the data. ggplot2 treats data outside the
limits as NA.

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

2015-04-23 12:06 GMT+02:00 Axel Urbiz <axel.urbiz op gmail.com>:

> Hello,
>
> I'm getting a warning message from the reproducible example below.
>
> Why would geom_errorbar() remove 2 cases in this case? Both upper and lower
> limits of the error bar contain var1 and are within the axis limits.
>
>
> df <- data.frame(var1 = seq(0, 1, 0.1), var2 = seq(0, 1, 0.1))
> df$ll <- ifelse(df$var1 == 0, 0, df$var1 - 0.05)
> df$ul <- ifelse(df$var1 == 1, 1, df$var1 + 0.05)
> pp1 <- ggplot(data = df,
>             aes(x = var2, y = var1)) +
>             geom_line() + geom_point() +
>             scale_x_continuous(limits = c(0, 1), breaks = seq(0, 1, 0.1)) +
>             scale_y_continuous(limits = c(0, 1), breaks = seq(0, 1, 0.1))
> pp1
> pp2 <- pp1 + geom_errorbar(data=df,
>               aes(ymin=ll,ymax=ul), width=0.02)
> pp2
> Warning message:
> In loop_apply(n, do.ply) :
>   Removed 2 rows containing missing values (geom_path).
> >
>
> Thanks for any pointers.
>
> Best,
> Axel.
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help op r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

	[[alternative HTML version deleted]]