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MathGroup Archive 1999

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TridiagonalSolve gone?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20337] TridiagonalSolve gone?
  • From: psalzman at landau.ucdavis.edu
  • Date: Fri, 15 Oct 1999 20:20:56 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

i'd like to use TridiagonalSolve[].   it doesn't seem to be working.

   TridiagonalSolve[a,b,c,d]

returns

  TridiagonalSolve[a,b,c,d]

with a, b, c and d expanded as lists.   so i went to the help browser and
looked up TridiagonalSolve.  it gave a short example which i copied and
pasted into a notebook.  everything went fine until the very last line:

TridiagonalSolve[a, b, c, {2, 3, 4, 5}]

which according to the help browser should have a value

\!\({\(-\(28\/9\)\), 26\/9, 5\/27, 20\/81}\)

but instead, in my notebook it returned:

TridiagonalSolve[{7, 1, 11}, {4, 8, 2, 12}, {5, 9, 3}, {2, 3, 4, 5}]

and i did make sure to <<LinearAlgebra`Tridiagonal`.   any thoughts as to
why this function isn't working?

pete




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