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

MathGroup Archive 2011

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

Search the Archive

Re: Initial condition with DSolve in Mathematica 8 doesn't work

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116020] Re: Initial condition with DSolve in Mathematica 8 doesn't work
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Sat, 29 Jan 2011 05:27:43 -0500 (EST)

I thought the Home Version would be the same as any other, but:

DSolve[{y'[x] + y[x] == a Sin[x], y[0] == 0}, y[x], x]

{{y[x] -> -(1/2) a E^-x (-1 + E^x Cos[x] - E^x Sin[x])}}

$Version

"8.0 for Mac OS X x86 (64-bit) (November 6, 2010)"

Bobby

On Fri, 28 Jan 2011 05:14:21 -0600, Bert RAM Aerts  
<bert.ram.aerts at gmail.com> wrote:

> When I enter the following in Mathematica 8.0.0 Home Edition:
> DSolve[{y'[x] + y[x] == a Sin[x], y[0] == 0}, y[x], x]
> I get
> DSolve::deqn: Equation or list of equations expected instead of True
> in the first argument {y[x]+(y^\[Prime])[x]==a Sin[x],True}. >>
>
> The initial condition becomes a "True"...
>
> In Mathematica 7.0.1 Home Edition, this same input gives the expected
> output:
> {{y[x] -> -(1/2) a E^-x (-1 + E^x Cos[x] - E^x Sin[x])}}
>
> What am I missing?
>


-- 
DrMajorBob at yahoo.com


  • Prev by Date: Re: MatrixPlot
  • Next by Date: Re: Initial condition with DSolve in Mathematica 8 doesn't work
  • Previous by thread: Re: Initial condition with DSolve in Mathematica 8 doesn't work
  • Next by thread: Re: Initial condition with DSolve in Mathematica 8 doesn't work