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Re: Why is y a local variable here?

• To: mathgroup at smc.vnet.net
• Subject: [mg63099] Re: [mg63085] Why is y a local variable here?
• From: ggroup at sarj.ca
• Date: Wed, 14 Dec 2005 04:36:00 -0500 (EST)
• References: <200512130841.DAA08255@smc.vnet.net>
• Reply-to: ggroup at sarj.ca
• Sender: owner-wri-mathgroup at wolfram.com

On Tuesday, December 13, 2005 at 03:41 GMT -0500, Steven T. Hatton wrote:
<snip>
> I do not understand why y is not "contaminated" by the global value when it
> appears in sd[y_] = SDP[n - 1, y];. Can someone explain this?

Don't you need to use SetDelayed instead of Set?  In other words,
doesn't the syntax for a function definition need to be something
like: sd[y_]:=SDP[x-1, y]; or sd=Function[y, SDP[x-1,y]; ?

• References:
  • Why is y a local variable here?
    • From: "Steven T. Hatton" <hattons@globalsymmetry.com>