From: Brian Gough <bjg@network-theory.co.uk>
To: "Alexander Babansky" <babansky@mail.ru>
Cc: <gsl-discuss@sources.redhat.com>
Subject: Re: gsl-1.2
Date: Sun, 03 Nov 2002 22:11:00 -0000 [thread overview]
Message-ID: <15813.15130.826338.584075@debian> (raw)
In-Reply-To: <000501c28242$fced2e90$8aa60a44@home1>
Alexander Babansky writes:
> Hi, I've found a small bug in Ei(x) function Reference
> manual(section Exponential Integral) In definition of Ei(x) it
> should be: Ei(x) := - PV(\int_{-x}^\infty dt \exp(-t)/t) (with "-"
> sign).
> True mathematical definition of Ei(x) is: Ei(x) :=
> PV(\int_{-infinity}^x dt \exp(t)/t When you change varibles, x-> -x
> you will get that "-" sign. Bug is only in Reference manual not in
> Ei(x) itself.
Thanks, I'll correct it.
regards
Brian Gough
prev parent reply other threads:[~2002-11-03 15:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-03 7:17 gsl-1.2 Alexander Babansky
2002-11-03 22:11 ` Brian Gough [this message]
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