Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Simplify doesn't simplify SparseArrays

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49479] Simplify doesn't simplify SparseArrays
  • From: semorrison_ at hotmail.com (Scott Morrison)
  • Date: Wed, 21 Jul 2004 06:40:29 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

For example, I was expecting

Normal[Simplify[SparseArray[{{1,1}->1/q^2+q(1/q+q)},{1,1}]]]

to return the same as

Simplify[Normal[SparseArray[{{1,1}->1/q^2+q(1/q+q)},{1,1}]]]

but it doesn't. Any suggestions for a modification? I was thinking of
unprotecting SparseArray, and defining

SparseArray /: Simplify[sa_SparseArray] :=
   SparseArray[Simplify[ArrayRules[sa]],Dimensions[sa]]

Should this work? Would it be better for this definition to go with
Simplify rather than SparseArray?

Thanks, Scott Morrison


  • Prev by Date: Re: Diophantic Equations with Constraints
  • Next by Date: Re: Diophantic Equations with Constraints
  • Previous by thread: RE: Applying my function to elements of a vector
  • Next by thread: Admin - Posts getting filtered