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MathGroup Archive 2007

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Re: Solving differential equations with parameters

  • To: mathgroup at smc.vnet.net
  • Subject: [mg79822] Re: Solving differential equations with parameters
  • From: Ivan <darknails at gmail.com>
  • Date: Sun, 5 Aug 2007 04:59:30 -0400 (EDT)
  • References: <f91j5e$677$1@smc.vnet.net>

On Aug 4, 12:07 pm, Ivan <darkna... at gmail.com> wrote:
> Hi, I am trying to solve the differential equations like
>
> y'[x]= - Sin[ p*x + y[x] ]
>
> where p is a parameter. Now I want to solve the equation with respect
> to x for a range of values of p, instead for just a single p.
> What is the best way to do it?

I now have a way to do it but there is another problem..

I use the Table command (I change the function for the sake of
demonstration)

sol = NDSolve[{y'[x]==1/2y[x],y[0.01]==0.1}, y, {x, 0.01,1}];

g=Table[ {y[i*0.01]/.sol}, {i,100} ];

ListPlot[g];

The error message is gptn: Coordindate .. in ... is not a floating-
point number.

The problem seems to be that y[x]/.sol generate not a "normal" number,
instead, the number is is a brace {...}.

Can anyone help me?



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