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Failure to Evaluate?

• To: mathgroup at smc.vnet.net
• Subject: [mg49842] Failure to Evaluate?
• From: "Scott Guthery" <sguthery at mobile-mind.com>
• Date: Tue, 3 Aug 2004 01:11:14 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

f:=Function[#1^2/#1+1]

g:=Function[#1^4+7]

h:=D[f]/D[g]

h[1]

Gives

((#1^2/#1)+1 &)/(#1^4+7 &)[1]

Why doesn't it evaluate by setting #1 to 1 to get 1/4?

h/.#1->1//N sets #1 to 1 and gives

(1 1 + 1 &)/(1 + 7 &)

but still doesn't evaluate to 1/4.

What gives? What's the Right Stuff?

Thanks for any insight.

Cheers, Scott

• Follow-Ups:
  • Re: Failure to Evaluate?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • Re: Failure to Evaluate?
    • From: DrBob <drbob@bigfoot.com>