[R-pkg-devel] Redefinition of generic for plot function breaks plot.formula

Dear all,

CRAN policies do not allow that single methods (for generic functions)
which are defined in base or recommended packages are replaced. They advice
package authors to replace the standard generic and use a xxx.default
method which then calls the original standard generic.

Using the following code


## overwrite standard generic
plot <- function(x, y, ...)
    UseMethod("plot")

## per default fall back to standard generic
plot.default <- function(x, y, ...)
    graphics::plot(x, y, ...)

## now specify modified plot function for data frames
plot.data.frame <- function(x, variables = names(x), ...)


essentially works for all tested plot.xxx functions. Yet, it breaks
plot.formula. How can I proceed to overwrite plot.data.frame without
breaking plot.formula. Any help is greatly appreciated.

For a detailed description of the problem with syntax highlighting and
code to reproduce the problem please see:


http://stackoverflow.com/questions/32246361/redefinition-of-generic-for-plot-function-breaks-plot-formula

Best,
Benjamin
--

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Dr. rer. nat. Benjamin Hofner

Institut f?r Medizininformatik, Biometrie und Epidemiologie
Friedrich-Alexander-Universit?t Erlangen-N?rnberg
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