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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
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