geom_text giving NAs introduced by coercion

[Chris Brien]

Hi all,

I am adding to lines of text to the last facet of a facet_grid plot and I get 4 warning messages saying that "NAs introduced by coercion".

The code for the plot is below and the plot that is produced looks fine. It is just the annoying warnings that do not appear if I remove the geom_text geoms. Any suggestions as to why I am getting these messages?

Cheers,

Chris

x.lev <- levels(Sources)
annot <- data.frame(Inf, -Inf, factor(x.lev[length(x.lev)], levels = x.lev))
names(annot) <- c("xDay", "backtransformed.predictions", "Sources")
 windows()
  pred.plot <-  ggplot(data=backtransforms,
                         aes_string(x = x.var, y = "backtransformed.predictions")) +
                         scale_colour_manual(values=cbPalette) +
                         scale_shape_manual(values=symb) +
                         scale_x_continuous(x.title) +
                         scale_y_continuous(y.title) +
                         layer(geom = "line", colour = cbPalette[1]) +
                         layer(geom = "point", shape = symb[7])  +
                         facet_grid(~ Sources)
pred.plot <- pred.plot + geom_ribbon(aes(ymin=lower.confidence.limit, ymax=upper.confidence.limit), 
                                    alpha=0.2, fill="blue", show_guide=FALSE) + scale_fill_hue() +
                          geom_text(data = annot, label = "Error bars are",
                                    hjust=1, vjust=-1.3, size = 2) +
                          geom_text(data = annot, label = "confidence intervals",
                                    hjust=1, vjust=-0.3, size = 2)
pred.plot

[John Helly]

Hi.

I'm struggling again with annotate.

This time I'm reversing the y-axis and cannot understand why the line
segment is not passing through the specified end-points. It hits the
starting point but the other end just goes off the plot. If I don't
reverse the y-axis it works as expected.

Any help is much appreciated. Attached is a reproducible example.

J.

--
John Helly, University of California, San Diego / San Diego Supercomputer Center / Scripps Institution of Oceanography / 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) / http://www.sdsc.edu/~hellyj

[John Helly]

Hi.

I'm struggling again with annotate.

This time I'm reversing the y-axis and cannot understand why the line
segment is not passing through the specified end-points. It hits the
starting point but the other end just goes off the plot. If I don't
reverse the y-axis it works as expected.

Any help is much appreciated. Attached is a reproducible example.

Thanks.

[Winston Chang]

Hm, I think that's probably a bug. It seems to not be reversing the xend and yend values for annotate(). I've filed it here:

https://github.com/hadley/ggplot2/issues/706

In the meantime, you can create a separate data frame for the segment annotation, and use it with geom_segment:

segment <- data.frame(x=34.00, y=-0.3, xend = 34.5, yend = -0.1)

ggplot(C, aes(Salinity, dO18, color=Site)) +

  geom_point(size=3) +

  geom_segment(data=segment, aes(x=x, y=y, xend=xend, yend=yend),

               linetype=2, color="black") +

  scale_y_reverse()

-Winston

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[John Helly]

Thanks very much.
J.

-Winston

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