frequency histogram labels and scale of x axis

[Reginaldo Ré]

I'm trying to put labels in a frequency histogram and change the scale of x axis... but still now, I can't...

str(mydata)

'data.frame': 1000 obs. of  2 variables:

 $ Req : int  1 2 3 4 5 6 7 8 9 10 ...

 $ Time: int  1638 749 702 811 734 826 858 734 733 749 ...

I'm using

ggplot(data = mydata, aes(x = Time)) + geom_histogram()

So, how to put labels below of each bar showing the frequency?

and, how to change x axis, using a different scale, for example, 1000, instead of 5000 ?

thanks a lot,

rr.

[Doug Mitarotonda]

See `scale_x_continuous`, it has `labels`, `breaks`, and `limits` arguments that you can use to make the adjustments you desire.

http://docs.ggplot2.org/current/scale_continuous.html

Cheers,

Doug

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[Ben Bond-Lamberty]

Here's a reproducible (hint!) example:

> df <- data.frame(x=rnorm(1000))

> p <- ggplot(df,aes(x))+geom_histogram()

> print(p)

stat_bin: binwidth defaulted to range/30. Use 'binwidth = x' to adjust this.

Note that ggplot warns that it's selected a default bin width. If you want to show frequency, the simplest thing to do is make a density plot:

> p1 <- ggplot(df,aes(x))+geom_density()

If you want a relative histogram, see http://stackoverflow.com/questions/10064080/plot-relative-frequencies-with-dodged-bar-plots-in-ggplot2 and related answers.

In addition to what Doug said, there are two ways to adjust the x axis limits: first, xlim(), which will truncate the data, and second, coord_cartesian(), which 'zooms' in without truncating data.

> # these do not produce the same plot

> p1 + xlim(c(-2,2))

> p1 + coord_cartesian(xlim=c(-2,2))

Ben