You may want to try Sage 4.3.rc1 and something like this
sage: y=function('y',x)
sage: desolve_laplace(diff(y,x,6) == y,y,ivar=x,ics=[0,1,2,5,6,7,3])
1/6*(sqrt(3)*sin(1/2*sqrt(3)*x) - 3*cos(1/2*sqrt(3)*x))*e^(-1/2*x) -
1/6*(3*sqrt(3)*sin(1/2*sqrt(3)*x) + 17*cos(1/2*sqrt(3)*x))*e^(1/2*x) +
1/3*e^(-x) + 4*e^x
Or install patch http://trac.sagemath.org/sage_trac/ticket/6479
Robert
On 15 pro, 12:19, "Jari-Pekka Ikonen" <jari-pekka.iko...@kolumbus.fi>
wrote:
> Hello,
>
> I wrote in Sage:
>
> maxima.clear('x'); maxima.clear('fnth')
>
> maxima.de_solve_Laplace("diff(fnth(x),x,60) = fnth(x)", ["x","fnth"], [0,1,5
> 2,3,65,8,9,5,43,2,4,5,6,5,3,2,4,6,76,8,7,56,4,3,3,4,5,6,8,9,7,5,4,3,4,5,6,7
> 9,7,5,4,4,3,4,5,6,7,7,6,5,4,3,5,6,6,5,5,4,4])
>
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