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Re: NDSolve and error

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92556] Re: [mg92545] NDSolve and error
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 5 Oct 2008 06:05:14 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

You typed y[t] rather than y[x]


Bob Hanlon

---- dodatki at poczta.fm wrote: 

=============
Hello!
Lately I wrote simple code in Mathematica

sol[p_] :=
  NDSolve[{Sqrt[
          1 + (y'[t])^2] == (x^(p - 1) + (y[x])^(p - 1)*y'[x])/(x^p +
                y[x]^p)^(1 - 1/p), y[1] == 6}, y, {x, 1, 4}]

but when I typed sol[2] the following kind of error was shown:

NDSolve::"ndnum": "Encountered non-numerical value for a derivative at
\
\!\(x\) == \!\(4.587812868332132`*^-296\)."

May I know what I'm doing wrong? Or how can I improve that code to
work correctly?
Thank you in advance
                                  John


--

Bob Hanlon



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