On Fri, 19 Oct 2007, John Sorkin wrote:
>
> As Marc points out, the documentation does say that usr can only be set
> by par. Perhaps the R development team would consider modifying the code
> of plot to check for the usr parameter, and if found print an error
> message.
Unfortunately it's not as easy as this. plot() is a generic function, and
there is nothing to stop someone from defining a method with a parameter
called 'usr'. For NextMethod() to work, plot() must be able to ignore
parameters it does not understand.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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