Or slightly more conveniently, use the default value of getOption() to return
the vector
of color names if the option is not set, e.g.
foo <- function(x, heplot.colors = getOption("heplot.colors",
c("red", "blue", "black",
"darkgreen", "brown", "darkgray")), ...) {
D.
On 5/10/12 10:09 AM, Simon Urbanek wrote:
>
> On May 10, 2012, at 9:59 AM, Michael Friendly wrote:
>
>> This may be elementary, but I can't find an answer: How can I set up global
>> options for
>> some specific arguments to functions in a package which can be easily
>> changed by the user?
>>
>> This question relates to the selection of colors used in functions in
>> several packages (heplots,
>> genridge), where I want to provide reasonable default values for plots, but
>> allow users to
>> change those defaults globally for all plots produced with my functions.
>>
>> One solution is to use palette() for the default, as in
>>
>> foo <- function(x, col=palette(), ...) {}
>> but the standard palette is not appropriate for my use, and I'd rather not
>> hijack more typical uses
>>
>> Another is to use an explicit list of colors for default, as in
>>
>> bar <- function(x, col=c('red', 'blue', 'brown', 'darkgreen', ...), ...) {}
>> but this must be overridden each time by someone to wants to change the
>> defaults.
>>
>> options() seems like the way to go, but I'm not sure how to implement this.
>> If I use
>> a .onLoad function to set some options, will these be created in the global
>> environment?
>> If not, how to make them so?
>>
>> .onLoad <- function() {
>> options(heplot.colors =
>> c("red", "blue", "black", "darkgreen", "darkcyan","magenta",
>> "brown","darkgray"))
>
> You certainly don't want to do that - it would override user's setting and
> thus defeat the whole purpose of options.
>
>
>> }
>>
>> My function could then use
>>
>> foo <- function(x, getOption("heplot.colors"), ...) {}
>>
>
> You can always do that:
>
> foo <- function(x, heplot.colors = getOption("heplot.colors"), ...) {
> if (is.null(heplot.colors)) heplot.colors <- c("red", "blue", "black",
> "darkgreen", "darkcyan","magenta", "brown","darkgray")
>
> Cheers,
> Simon
>
>
>>
>> --
>> Michael Friendly Email: friendly AT yorku DOT ca
>> Professor, Psychology Dept.
>> York University Voice: 416 736-5115 x66249 Fax: 416 736-5814
>> 4700 Keele Street Web: http://www.datavis.ca
>> Toronto, ONT M3J 1P3 CANADA
>>
>> ______________________________________________
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>>
>>
>
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