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MathGroup Archive 2004

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Re: Length of actual parameters in a function call.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg47096] Re: Length of actual parameters in a function call.
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 26 Mar 2004 03:55:37 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <c3udpe$9om$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

what may

MyFunction[a_, b_, c_] := a*b*c
MyFunction[a___] := Length[{a}]

do ? Print the number of paramters when it is not called
with 3 paramters ?

Regards
  Jens


"E. Martin-Serrano" wrote:
> 
> Hi,
> 
> A few weeks ago, reviewing some tutorials on pattern matching and error
> handling, I came across an undocumented function to monitor the number of
> parameters submitted to a function in a call; but somehow I lost its track
> later. I guess that it must be something well-known by our specialists. Any
> help about where to locate it?
> 
> The undocumented feature helps in tracking situations as when we define
> "MyFunction[a_,b_,c_]:= something" and then it is called as "myFunction[a]"
> leaving the function unevaluated.
> 
> E. martin-Serrano


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