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Re: default options, OptionsPattern[], and FilterRules[]
*To*: mathgroup at smc.vnet.net
*Subject*: [mg106482] Re: default options, OptionsPattern[], and FilterRules[]
*From*: dh <dh at metrohm.com>
*Date*: Thu, 14 Jan 2010 05:47:56 -0500 (EST)
*References*: <hik947$6qo$1@smc.vnet.net>
Hi Roman,
the simplies way to do what you want is to specify:
SetOptions[Plot,PlotRange->{-5,5}]
If you nevertheless want to write your own function, you must not forget
to give the default options in the plot command:
Options[myplot] = {PlotRange -> {-5, 5}};
myplot[F_, opts : OptionsPattern[]] :=
Plot[F, {x, -1,
1}, (Evaluate[
Join[FilterRules[{opts}, Options[Plot]], Options[myplot]]])]
myplot[x]
Daniel
Roman wrote:
> dear group,
> I am trying to set up a plotting function which has a different
> default behavior than the standard one. Here's a simple example:
>
> Options[myplot] = {PlotRange -> {-5, 5}};
> myplot[F_, opts : OptionsPattern[]] :=
> Plot[F, {x, -1, 1}, Evaluate[FilterRules[{opts}, Options[Plot]]]]
>
> What I would like to achieve with this is that when I don't specify
> the PlotRange option, as in
> myplot[Sin[x]]
> then I would get a plot with a default plot range of {-5,5}.
> Unfortunately this does not work, since the call to FilterRules[] does
> not access the default rules defined in Options[myplot], but only
> those options explicitly specified in opts (i.e. none at all in this
> call example).
>
> Since this seems like such a standard use of the Options framework of
> Mathematica, I would expect there to be pre-defined functionality for
> what I am trying to achieve. Of course I can manually merge the
> contents of the opts variable with those of Options[myplot] and
> eliminate duplicates, but I'd like to avoid such hacks if possible.
>
> Do you know a simple solution for this problem?
> Thanks!
> Roman.
>
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