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Re: What is the precedence wrt Mathematica infix operators

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82840] Re: [mg82800] What is the precedence wrt Mathematica infix operators
  • From: "Thomas Dowling" <thomasgdowling at gmail.com>
  • Date: Thu, 1 Nov 2007 05:11:01 -0500 (EST)
  • References: <200710311113.GAA22477@smc.vnet.net>

Hello,

There is an undocumented function, Precedence, which can be useful:

Precedence /@ {Plus, Minus, Times, Power, Apply, Map}

gives the output:

{310., 480., 400., 590., 620., 620.}

I can't remember where I got this info, but it may have been in a
presentation by Kris Carlson.

Tom Dowling

On 10/31/07, congruentialuminaire at yahoo.com <congruentialuminaire at yahoo.com>
wrote:
>
> Hello Mathematica UG:
>
> I cannot find operator precedence documented anywhere. With the
> operators from Fortran (in the old days) this was always clear, i.e
> '/' before '-'.
>
> I have been reading some code in the Trott Guidebooks which has
> constructions like 'Head @@ face[[i]] / order'. I can guess that Part
> has precedence in this expression, but what about Apply vs. Times?
>
> Looking at the OutputForm shows that Apply has precendence. But,...
>
> - Is this documented somewhere?
> - Do all Mathematica operators take precedence over arithmetic operators?
>
> TIA.
>
> Regards..
>
>
>



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