Re: Slow LinearSolve.
- To: mathgroup at smc.vnet.net
- Subject: [mg49683] Re: Slow LinearSolve.
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Tue, 27 Jul 2004 07:01:35 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 7/26/04 at 4:02 AM, aaronfude at yahoo.com (Aaron Fude) wrote:
>Within 24 hours and counting, Mathematica was not able to solve Ax
>= b for the following A and the following B. Another system does
>this in a matter of seconds. How do make Mathematica do the same? I
>use "LinearSolve[A, b]"
<snip definition of A and b>
Is the other system performing exact aritmetic? Do you really need an exact solution?
$Version
"5.0 for Mac OS X (June 10, 2003)"
Timing[Chop[LinearSolve[N[A], N[b]]]]
{0.010000000000000009*Second,
{0.07446350815950518,
0.42971490576148197,
-0.07819866153722022,
0.8882136952406927,
-0.7103217579965401,
1.5245842254668558,
-1.1153191765998371,
1.5245842254671313,
-0.7103217579969479,
0.8882136952410542,
-0.07819866153743803,
0.4297149057615676,
0.07446350815948745}}
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