At Fri, 27 Oct 2006 12:43:05 +0100, Lionel Barnett wrote: > It appears that the function gsl_sf_ellint_E(phi,m) is periodic with > period 2\pi. However, E(\phi|m), even under the definition at: > > http://www.gnu.org/software/gsl/manual/html_node/Definition-of-Legendre-Forms.html#Definition-of-Legendre-Forms > > is actually *quasi*-periodic, satisfying the relation: > > E(\phi+n\pi,m) = 2n E(m) + E(\phi,m) > > Now I can use this relationship to calculate the correct value of > E(\phi,m) for larger \phi ... except for \pi/2 < \phi < \pi >
Just to let you know this has now been fixed in CVS for the next release (http://sources.redhat.com/gsl/devel.html) - the values should be correct for all values of phi now. -- Brian Gough (GSL Maintainer) Network Theory Ltd, Publishing the GSL Manual - http://www.network-theory.co.uk/gsl/manual/ _______________________________________________ Help-gsl mailing list Help-gsl@gnu.org http://lists.gnu.org/mailman/listinfo/help-gsl