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MathGroup Archive 2002

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  • To: mathgroup at smc.vnet.net
  • Subject: [mg32308] Return
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Sat, 12 Jan 2002 05:18:25 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

In view of the recent thread on Holding Arguments in a Second Argument List
the following notes on Return may be of interest:

If Return[x] is generated as a value in  Do or Scan then  x is immediately
returned;
If  Return[x] is generated as an entry in CompoundExpression or as a value
of the body of a While or For loop then  Return[x] (not x) is immediately
returned;
If  Return[x]  is generated as the value of a user-defined function then the
function returns  x (not Return[x])
Otherwise Return[x] behaves as a ordinary expression.

EXAMPLES

    Do[Return[2],{4}]
    Scan[If[#>1,Return[#]]&, {1,2,3}]

        2

        2

    1;Return[2];3
    While[True, Return[2]]
    For[1,True,2, Return[2]]

        Return[2]

        Return[2]

        Return[2]

    f[x_]:= Return[x]
    f[2]

        2

    {Return[2]}

        {Return[R[2]]}
--
Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565






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