[R] ggplot question: changing the label for the Y axis on a histogram

[Steven Rytina, Prof.]

Thanks for taking a look.

	As you can see from my (reduced) example below, I am drawing on counts and then asking bin to aggregate.
	My hunch is that ylab() somehow gets over-ridden in the collaboration implicit in geom_histogram.

	Accordingly, any comment that illuminates the actual mechanics invoked by this (and how to examine them) would be much appareciated. 
	
vals<-c(-2.601,-2.073,-1.341,-1.126,-1.022,-0.847,-0.839,-0.791,-0.790,-0.683,-0.572,-0.556,-0.538,-0.454,-0.394,-0.342,-0.313,-0.184,-	0.138,0.302,0.307
		,0.364,0.796,0.830,0.992,1.029,1.305,1.334)
	cnts<-c(186.8,541.0,221.5,191.2,545.6,317.9,375.6,335.5,154.4,199.1,305.1,302.4,179.2,164.8,155.0,281.4,158.6,560.3,208.6,164.1,157.2
		,505.2,1282.9,181.6,273.0,315.3,166.9,222.8)
	qdata<-as.data.frame(cbind(vals,cnts))
	qplot(vals,weight=cnts,data=qdata,binwidth=.29,main="test")+ylab("NEW")

-----Original Message-----
From: istazahn at gmail.com [mailto:istazahn at gmail.com] On Behalf Of Ista Zahn
Sent: Monday, July 25, 2011 2:02 PM
To: Steven Rytina, Prof.
Cc: r-help at r-project.org
Subject: Re: [R] ggplot question: changing the label for the Y axis on a histogram

Hi Steven,
The basic example works:

qplot(rnorm(100)) + ylab("Bin Counts")

Please post a reproducible example that illustrates the problem you are having.

Best,
Ista

On Mon, Jul 25, 2011 at 1:40 PM, Steven Rytina, Prof.
<steven.rytina at mcgill.ca> wrote:
> Some help with how to re-label the vertical axis in a histogram  would be appreciated.
>
>                qplot(off.sc,weight=rel.freq,binwidth=.29,main="test Figure"+ylab("New from inside"))+ylab("New from outside")+
>                                                                xlab("off.sc\nAggregated frequency plots for 17 equal intervals.")
>
> The code produces a proper histogram. However, the y axis is labeled count
>                and this needs to be changed because the data is relative frequencies (sample proportions.)
> ylab() does not do the trick (in either position). Does anyone know what works?
>
>                Thanks
>                Steve Rytina, McGill University
>
>        [[alternative HTML version deleted]]
>
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-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org