Re: TridiagonalSolve gone?
- To: mathgroup at smc.vnet.net
- Subject: [mg20357] Re: TridiagonalSolve gone?
- From: "Kevin J. McCann" <kevinmccann at Home.com>
- Date: Sun, 17 Oct 1999 02:45:35 -0400
- Organization: @Home Network
- References: <7u7tcp$p65@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Let me try again.
<<LinearAlgebra`Tridiagonal`
{a, b, c, d} =
{{7, 1, 11}, {4, 8, 2, 12}, {5, 9, 3},{2,3,4,5}}
TridiagonalSolve[a,b,c,d]
or
TridiagonalSolve[{7, 1, 11}, {4, 8, 2, 12}, {5, 9, 3}, {2, 3, 4, 5}]
returns
{-(28/9), 26/9, 5/27, 20/81}
<psalzman at landau.ucdavis.edu> wrote in message
news:7u7tcp$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
>
>
>