Re: Mixing optional parameters and options
- To: mathgroup at smc.vnet.net
- Subject: [mg116172] Re: Mixing optional parameters and options
- From: thomas <thomas.muench at gmail.com>
- Date: Fri, 4 Feb 2011 01:38:13 -0500 (EST)
- References: <iie0bv$bt3$1@smc.vnet.net>
See here for a solution to this problem, provided by Leonid Shifrin: http://groups.google.com/group/comp.soft-sys.math.mathematica/browse_frm/thread/35ff6cf97d5019ec/df1b14a433eb2fa6?lnk=gst&q=Functions+with+variable+number#df1b14a433eb2fa6 thomas On Feb 3, 11:34 am, Peter Breitfeld <ph... at t-online.de> wrote: > To give a simpe example which, I hope, makes clear my issue: > Suppose I define this (silly) example function: > > Options[f]={bla->True}; > f[x_,y_:11,OptionsPattern[]:=If[OptionValue[bla],x*y,y/x] > > Now: > f[5] ----> 55 (ok) > f[5,7] ----> 35 (ok) > > f[5,7,bla->False] ----> 7/5 (ok) > f[5,bla->False] ----> 5*(bla->False) > > I expected the result 11/5 > > The only way I found was to define f like this: > > f[{x_,y_:11},OptionsPattern[]] > > Can it be done without the curly braces? > > Thank you > -- > _________________________________________________________________ > Peter Breitfeld, Bad Saulgau, Germany --http://www.pBreitfeld.de