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MathGroup Archive 1999

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Re: TridiagonalSolve gone?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20349] Re: TridiagonalSolve gone?
  • From: "Kevin J. McCann" <kevin.mccann at jhuapl.edu>
  • Date: Sat, 16 Oct 1999 00:47:40 -0400
  • Organization: Johns Hopkins University Applied Physics Lab, Laurel, MD, USA
  • References: <7u7tcp$p65@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Check out AddOns->StandardPackages->LinearAlgebra->Tridiagonal.

--

Kevin J. McCann
Johns Hopkins University APL
<psalzman at landau.ucdavis.edu> wrote in message
news:7u7tcp$p65 at smc.vnet.net...
> 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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