[R] Tilde in boxplots

[Bert Gunter]

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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