Changing shape in pointrange()

[Alexa]

Hey all,

I'm using pointrange() so that I have a line graph with points and
error bars. I'd like to be able to change the shape of the points. I'm
trying,


G <- ggplot(new.data,aes(x=X,y=value,linetype=variable))+
geom_line(size = 0.2) +
scale_x_continuous("JD - 2450000", breaks = c(5100, 5150, 5200, 5250,
5300, 5350), labels = c("5100", "5150", "5200", "5250", "5300",
"5350")) +
scale_y_continuous("Intensity (Arbitrary Units)") +
coord_cartesian()

Graph3 <- Graph2 + geom_pointrange(aes(ymax = value + error, ymin =
value - error))
Graph3 + scale_shape_manual(values = c(1,20))

But my scale_shape_manual is not changing anything, I've tried several
values. Any suggestions?

[Dennis Murphy]

Hi:

Where's the shape aesthetic? I see linetype, but that's it. Without defining shape as an aesthetic somewhere (i.e., mapped to values of a variable), scale_shape_* won't (and can't) do anything to the defaults.

HTH,
Dennis

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[Alexa]

I'm using geom_line for the graph and pointrange() in order to have
glyphs at my data points. So I don't think adding shape aesthetic
would do anything since that's not where the points are coming from.
Why doesn't the scale_shape_manual affect shapes made using
pointrange?

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[Brandon Hurr]

If you're not telling it what to assign shapes to then what are you assigning the second shape in your scale manual call? 

+ scale_shape_manual(values = c(1,20))

B

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[Dennis Murphy]

Hi:

If you look at the help page for geom_pointrange(), you'll see that one of the arguments is shape.
http://had.co.nz/ggplot2/geom_pointrange.html

Change the default value of 16 to whatever shape number you wish. A list of shapes, along with their numerical codes, is given in Figure B.1, p. 197 of Hadley's ggplot2 book.

HTH,
Dennis

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[Alexa]

Hi,

When I try -

Graph2 + geom_pointrange(shape = c(5, 10), aes(ymax = value + error,

ymin = value - error))

I get an error message saying that aesthetics only takes one value.
I'd like to be able to have my two different data sets have two
different shapes representing them, anyway to do this?

Thanks

On Oct 27, 10:02 pm, Dennis Murphy <djmu...@gmail.com> wrote:
> Hi:
>

> If you look at the help page for geom_pointrange(), you'll see that one of

> the arguments is shape.http://had.co.nz/ggplot2/geom_pointrange.html

> > <ggplot2%2Bunsu...@googlegroups.com<ggplot2%252Bunsubscribe@googlegroup s.com>>

[Ben Bolker]

The "ggplot way", I think, is to merge (i.e. rbind) the two data
frames, adding a factor column that describes which data set each row is
from. Alternatively (much uglier) you can add separate layers with
separate data arguments and shape set manually to different values for each.