Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2009

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

Search the Archive

RowReduce::luc when using NSolve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg99135] RowReduce::luc when using NSolve
  • From: mereandor <mereandor at gmail.com>
  • Date: Tue, 28 Apr 2009 04:44:38 -0400 (EDT)

I try to solve a linear equation with the following input to mathematica:

NSolve[{BesselJ[0, 20] - BesselJ[0, 20] r[0] == 3 I BesselJ[0, 60 I] t[0], BesselJ[0, 20] + BesselJ[0, 20] r[0] == BesselJ[0, 60 I] t[0]}, {r[0], t[0]}]

but I get

RowReduce::luc: Result for RowReduce of badly conditioned matrix \
{{-0.167025+0. I,-1.61061*10^9-<<21>> I,0.167025+0. I},{<<1>>}} may \
contain significant numerical errors. >>

This is only the simplest instance of my problem (2(n+1) equations in equally numbered variables). If I don't write the equations down literally but insert them into NSolve as a Table[] statement I don't even get the warning. Then the equations are solved only partially expressing t[n] as linear combination of r[n].

I use Mathematica 6.0

How can I resolve this?

Thanks in advance for any help!


  • Prev by Date: Ted Erseks RootSearch Package $MinPrecision
  • Next by Date: Re: Re: MaxValue
  • Previous by thread: Ted Erseks RootSearch Package $MinPrecision
  • Next by thread: Re: RowReduce::luc when using NSolve