On Sun, Jul 18, 2010 at 7:29 PM, Mike Witt <[email protected]> wrote:
> OK, thanks a lot. That seems to work well. Just a quick follow
> up question. I feel like there must be a better way to get the
> result back into Sage variable. Could I be doing something
> in a better way ...
What you have seems good to me!
>
> sage: from sympy.abc import x
> sage: phi = Function("phi")
> sage: s = symbols('s')
> sage: my_sol = dsolve(Derivative(phi(x),x,x) + s*phi(x), phi(x))
> sage: my_sol
> C1*sin(x*s**(1/2)) + C2*cos(x*s**(1/2))
> sage: type(my_sol)
> <class 'sympy.core.add.Add'>
> sage: ss_sol = sage_eval(str(my_sol), locals={'x':x,'C1':C1,'C2':C2,'s':s})
> sage: ss_sol
> C1*sin(sqrt(s)*x) + C2*cos(sqrt(s)*x)
> sage: type(ss_sol)
> <type 'sage.symbolic.expression.Expression'>
>
>
> On 07/18/2010 03:24:12 PM, David Joyner wrote:
>>
>> sage: from sympy import Function, Derivative, dsolve, symbols
>> sage: from sympy.abc import x
>> sage: f = Function("f")
>> sage: k = symbols('k')
>> sage: dsolve(Derivative(f(x),x,x)-k**2*f(x), f(x))
>> C1*sin(x*(-k**2)**(1/2)) + C2*cos(x*(-k**2)**(1/2))
>>
>>
>> On Sun, Jul 18, 2010 at 4:31 PM, Mike Witt <[email protected]> wrote:
>> > http://trac.sagemath.org/sage_trac/ticket/8931
>> >
>> > I'm just curious if anyone can suggest a work-around for this?
>> > -Mike
>> >
>> > --
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>> >
>>
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>>
>>
>
>
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