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#1776 specint(exp(-s*t)*CONST*t^2*bessel_y(1,t),t) wrong

closed
nobody
5
2009-09-26
2009-09-26
Dieter Kaiser
No

Maxima does not take into a account a constant part of an integrand when doing the Laplace transform of bessel_y(v,a*t) where v is an integer order.

The symbol CONST is missing in the following result:

(%i5) ratsimp(specint(exp(-s*t)*CONST*t^2*bessel_y(1,t),t));
(%o5) (3*s*log((sqrt(s^2+1)+s)/(sqrt(s^2+1)-s))+sqrt(s^2+1)*(2*s^2-4))
/(%pi*sqrt(s^2+1)*(s^4+2*s^2+1))

The error is in the routine f2p105v2cond. The constant part is extracted from the variable l but not multiplied to the result of the Laplace transform.

Dieter Kaiser

Discussion

  • Dieter Kaiser
    Dieter Kaiser
    2009-09-26

    Fixed in hypgeo.lisp revision 1.66. Closing this bug report.

    Dieter Kaiser

     
  • Dieter Kaiser
    Dieter Kaiser
    2009-09-26

    • status: open --> closed