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MathGroup Archive 2006

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Re: Null's not null?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69408] Re: [mg69393] Null's not null?
  • From: "Chris Chiasson" <chris at chiasson.name>
  • Date: Mon, 11 Sep 2006 05:39:01 -0400 (EDT)
  • References: <200609101120.HAA11248@smc.vnet.net>

You could try using MakeBoxes[Null,StandardForm|TraditionalForm]="";

The method above will make Null in all standard output appear as an
empty string. If FullForm is used though, it will still show up as
Null.

As I'm sure you know, TableForm isn't a basic output form (it's a
wrapper), so MakeBoxes[Null,TableForm]="" won't work.



On 9/10/06, AES <siegman at stanford.edu> wrote:
> Putting Null into one or more slots in a Table and printing the Table
> shows "Null" (without quotes) at the corresponding positions, as also
> does ToString[Null].  I don't think that's what the Help message says:
>
>       "Null is a symbol used to indicate the absence of an
>        expression or a result. When it appears as an output
>        expression, no output is printed."
>
> I can use a string with a couple of empty spaces ("__") to represent an
> occupied but not empty slot in a Table, but that just looks clumsy to
> me.  Is there a truly non-printing Null symbol?
>
>


-- 
http://chris.chiasson.name/


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