R help - Feb 2009 - 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

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

Gilbert Brenes wrote:
> 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.