[R] Formatting Y axis.

ilai keren at math.montana.edu
Fri Feb 10 21:21:38 CET 2012

yaxt='n' in ?par and ?axis are your friends.

# A plot on log scale labeled with original:

Works for qqnorm and boxplots, as well as other top level fun.

By the way this is a FAQ.

On Fri, Feb 10, 2012 at 9:43 AM, sock.o <mrsockman at gmail.com> wrote:
> I've looked around and I just can't find anything that will work for my
> needs. This is a bit of a 2 part question but pertaining to the same topic
> so bare with me.
> The first is with my qq plot. On the Y axis of my qq plot it'll have my
> sample quantities but because my data is log-normal it'll show numbers
> between 0 - 5 (depending on the data). I'd like to know how to get it,
> instead of displaying 0-5 to display actual values so that way when reading
> it I know where my potential problems are. Would just save a lot of time and
> be an easier more understandable read. Here's sample code to plug in and
> see.
> x <- rlnorm(400, 2.3, .8)
> y <- rlnorm(400, 3, 1.6)
> plot.new()
>        q1 <- qqnorm(log1p(y))
>        q2 <- qqnorm(log1p(x))
>                points( q1, col = "red")
>                points( q2, col = "blue")
>                abline( qqline(log1p(y), col = "red") )
>                abline( qqline(log1p(x), col = "blue") )
>                legend( "bottomright", inset = 0.02, title = "Loc_ID", c("Sayincom",
> "Sayout"), fill = c( "red", "blue"), horiz = TRUE)
> So what I want is for the y axis. or even secondary y axis if it's lined up
> properly to read the actual values rather than the logged values.
> The second part of this is in regards to my boxplots. In order to fit all of
> the data in a readable manner I've been making log = "y". Which is fine, but
> when trying to estimate the difference via notches it's difficult to
> estimate how far it really is based on the axis being logged. You can use
> the same x as above, or y, whichever floats your boat.
> boxplot ( x,  notch = TRUE, log = "y", boxwex = .50)
> Versus
> boxplot ( x,  notch = TRUE, boxwex = .50)
> What I need from this is for the ability to zoom in on a particular
> location. Rather than be forced to look at things in a log format on my y
> axis to just be able to say, ok I have my mean at 25 and my standard
> deviation is 10 so I want to concentrate this boxplot between 5 and 45 to
> view 2 standard deviations. (That whole mean thing and standard deviations
> are arbitrary numbers but the concept remains)
> Any help would be much appreciated. If there are particular packages
> required for any suggestions please include their name in your response.
> If you need actual imaging of what the actual graphs I'm working with look
> like as opposed to the randomly generated values that I'm supplying then
> just say so and I'll post the actual graphs I'm trying to work with.
> Sincerely,
> Sock
> --
> View this message in context: http://r.789695.n4.nabble.com/Formatting-Y-axis-tp4376843p4376843.html
> Sent from the R help mailing list archive at Nabble.com.
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