Possible to centre x-axis ticks in geom_histogram?

[scott smith]

Hi,

just wondering if it is possible to move the x-axis ticks when using
geom_histogram so that they are in the middle of the bars, rather
than
the right hand edge of the bar.

can't find any mention on google....

here's my simple 2line plot

> m<-ggplot(data,aes(x=rest_delta))
> m + geom_histogram(aes(fill=..count..),binwidth=1)

thanks,
Scott

[Brandon Hurr]

If you got rid of the grey grid using theme_bw() and then the tick marks you could adjust the position of the axis text using opts() and vjust/hjust to get them where you want. 

That's a pretty manual solution though... perhaps there is a more automated solution? 

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[Hadley Wickham]

There's no general solution, because tick marks are supposed to
reflect the data scale...

But may you want to adjust the origin of the histogram so it falls
between the ticks:

library(ggplot2)
df <- data.frame(x = runif(100))
qplot(x, data = df, binwidth = 0.1)
qplot(x, data = df, binwidth = 0.1, origin = -0.05)

Hadley

--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/

[scott smith]

Thanks guys - the 'origin' command does the trick nicely!

cheers
Scott

On Nov 16, 3:47 pm, Hadley Wickham <had...@rice.edu> wrote:
> There's no general solution, because tick marks are supposed to
> reflect the data scale...
>
> But may you want to adjust the origin of the histogram so it falls
> between the ticks:
>
> library(ggplot2)
> df <- data.frame(x = runif(100))
> qplot(x, data = df, binwidth = 0.1)
> qplot(x, data = df, binwidth = 0.1, origin = -0.05)
>
> Hadley
>
>
>
> On Wed, Nov 16, 2011 at 7:18 AM, Brandon Hurr <brandon.h...@gmail.com> wrote:
> > If you got rid of the grey grid using theme_bw() and then the tick marks you
> > could adjust the position of the axis text using opts() and vjust/hjust to
> > get them where you want.
> > That's a pretty manual solution though... perhaps there is a more automated
> > solution?
>

[Gloria Kreitinger]

Is there an analogous solution to shifting the x-axis when creating a ggplot object (not a qplot object)?

Thank you,

Gloria

[Ito, Kaori (Groton)]

qplot(x, data = df, binwidth = 0.1, origin = -0.05)

 

is same with:

 

ggplot(data=df, aes(x=x)) + geom_histogram(binwidth = 0.1, origin = -0.05)

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[Gloria Kreitinger]

Thank you!