MathGroup Archive 2011

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: A two part notation question

  • To: mathgroup at
  • Subject: [mg120994] Re: A two part notation question
  • From: Simon <simonjtyler at>
  • Date: Sun, 21 Aug 2011 05:30:53 -0400 (EDT)
  • Delivered-to:
  • References: <j2le74$ndf$>
  • Reply-to: comp.soft-sys.math.mathematica at

Sometimes with these things it's easiest to resort to the low level MakeBoxes and MakeExpression. E.g.

f /: MakeBoxes[f[x_], form_] := With[{boxes = ToBoxes[x]}, 
  InterpretationBox[OverscriptBox[boxes, "_"], f[x]]]

OverscriptBox /: MakeExpression[OverscriptBox[x_, "_"], form_] := 
  MakeExpression[RowBox[{"f", "[", x, "]"}], form]

These definitions are stored in FormatValues[f] and FormatValues[OverscriptBox].
Although they don't need to be defined with TagSet (/:).  Also, the InterpretationBox is probably overkill since we have the MakeExpression definition.

You can check that things are working with 

In[7]:= f[x] // ToBoxes
Out[7]= InterpretationBox[OverscriptBox["x", "_"], f[x]]

In[8]:= Overscript[a+b, _]//FullForm
Out[8]//FullForm= f[Plus[a,b]]

  • Prev by Date: launch Mathematica 8 in Ubuntu 11.04
  • Next by Date: Re: Display BarChart ticks in AccountingForm?
  • Previous by thread: A two part notation question
  • Next by thread: Memory when reding in data