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Re: gsl-1.2
- From: Brian Gough <bjg at network-theory dot co dot uk>
- To: "Alexander Babansky" <babansky at mail dot ru>
- Cc: <gsl-discuss at sources dot redhat dot com>
- Date: Sun, 3 Nov 2002 15:04:58 +0000 (GMT)
- Subject: Re: gsl-1.2
- References: <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