Tilde in boxplots

boxplot is an (S3) generic function: ?UseMethod

1. Uses the default method.

2. Uses the formula method, since biomass~clipping is a formula: ?"~" ;
?formula; ?boxplot.

See also an Introduction to R where these matters are also explained.

-- Bert Gunter, Genentech 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Petter Hedberg
Sent: Thursday, February 12, 2009 6:45 AM
To: r-help at r-project.org
Subject: [R] Tilde in boxplots

Best contributors to the R-project.

I have noticed that when using boxplot diagrams, R interprets the
following two inputs very differently.

1: boxplot(biomass,clipping)

2:boxplot(biomass~clipping)

What is the significance of tilde in the boxplot graph.
I have not found it as one of the arguments when using the help
function ?boxplot.

Thankful for any help with this.

Best regards,

Petter Hedberg, University of Warsaw

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Hi.

Is it possible to draw a contour plot (with contour or filled contour) or a 
a surface plot (with persp or persp3d) with the z axis in a log scale?

Gilbert

Hi.

Is it possible to draw a contour plot (with contour or filled contour) 
or a a surface plot (with persp or persp3d) with the z axis in a log scale?

At least for contour(), you can specify logarithmic breaks.

Best,
Uwe Ligges

Gilbert

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Hi.

Is it possible to draw a contour plot (with contour or filled contour) or a 
a surface plot (with persp or persp3d) with the z axis in a log scale?

For persp or persp3d I think you'd have to do the log transformation 
yourself.  For example,

x <- 1:100
y <- 1:100
z <- outer(x,y, function(x, y) exp(x/10 + y/10)
logz <- log(z, 10)
persp3d(x,y,logz, axes=FALSE, zlab="z", col="red")
axes3d(c("x", "y"))
axis3d("z", at=pretty(logz), labels=10^pretty(logz))

Duncan Murdoch