[R] labeling the screeplot

[David Kaplan]

Greetings,

I'm using the screeplot command and in the R documentation it shows the 
general setup as

screeplot(x, npcs = min(10, length(x$sdev)),
           type = c("barplot", "lines"),
           main = deparse(substitute(x)), ...)

My question concerns labeling the screeplot and I see from the 
documentation that the main= function is referring to graphics 
parameters.  I don't know what this means or where to find information 
on this.  The plot automatically appears with the label "variances" on 
y-axis (which are actually the eigenvalues), and the label PCA on the 
top.  I wish to relabel.

Thanks in advance,

David
-- 
=======================================================================
David Kaplan, Ph.D.
Professor
Department of Educational Psychology
University of Wisconsin - Madison
Educational Sciences, Room 1061
1025 W. Johnson Street
Madison, WI 53706

email: dkaplan at education.wisc.edu
Web:   http://www.education.wisc.edu/edpsych/facstaff/kaplan/kaplan.htm
Phone: 608-262-0836
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