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MathGroup Archive 1993

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What do ya think about SymbolicSum?

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: What do ya think about SymbolicSum?
  • From: mek at guinan.psu.edu (Mark E. Kotanchek)
  • Date: Thu, 8 Apr 93 15:42:22 -0500

Trivial question here....

I was playing with Algebra`SymbolicSum` and noticed that although it worked in structures like

   SymbolicSum[k,{k,K}]
   

   K (1 + K)
   ---------
       2

that, if I used a number instead of K, I didn't get a nice simple result; i.e.,

   SymbolicSum[k,{k,6}]

returned

   SymbolicSum[k, {k, 6}]

rather than the expected "21" returned by using Sum[k,{k,6}]. Futhermore, Simplify[] and N[] didn't give  
me the numeric solution. To me, this behavior is inaccurate -- although, not strictly speaking a bug. Do  
you see any reason WRI shouldn't change SymbolicSum to operate with numbers as a symbol. For that  
matter, does WRI see any reason why the function works this way?

Toodles,

Mark.
---
Mark Kotanchek
Guidance & Control Dept - 363 ASB
Applied Research Lab/Penn State
P.O. Box 30
State College, PA 16804

e-mail:	mek at guinan.psu.edu (NeXTmail)
TEL:	(814)863-0682
FAX:	(814)863-7843





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