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MathGroup Archive 2004

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Re: DSolve change in v5 -- undocumented error message

  • To: mathgroup at smc.vnet.net
  • Subject: [mg46768] Re: DSolve change in v5 -- undocumented error message
  • From: Tom Burton <tburton at brahea.com>
  • Date: Sun, 7 Mar 2004 01:33:46 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,

Version 5.0.0.0 on Max OSX gives me

Solve::ifun: 
   Inverse functions are being used by Solve
    , so some solutions may not be found; use Reduce
      for complete solution information. More\[Ellipsis]
Out[2]=
              r t
             E    k n0
{{n[t] -> ----------------}}
                    r t
          k - n0 + E    n0

I verified the solution.

Tom Burton

On 3/4/04 9:05 PM, in article c298r9$56c$1 at smc.vnet.net, "Gareth Russell"
<gjr2008 at columbia.edu> wrote:

The following expression used to work in v4:

DSolve[{n'[t] == r*n[t]*(1 - n[t]/k), n[0] == n0}, n[t], t]

In v5, I get the message

"DSolve::bvfail: For some branches of the general solution, unable to
solve the conditions." ...


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