Message-ID: <CAGAA5bcSs+aUt-LBYtvJxfapoiZLfgQMNDB877WYCVxP9b1utg@mail.gmail.com>
Date: 2021-01-13T22:54:44Z
From: Martin Møller Skarbiniks Pedersen
Subject: log of small values in R
In-Reply-To: <CAGR+MS7n24pe05-XVPA2-of=43PzcS+NU5ANAqcbA-YRQ33ZUA@mail.gmail.com>
On Mon, 11 Jan 2021 at 08:22, Shaami <nzshaam at gmail.com> wrote:
>
> Dear Friends I am facing the problem of log values in R. The
> log(1-0.99999999999999999) is giving -Inf while log(1e-18) gives finite
> answer. Any suggestion to deal with this problem? Thank you
This vignette has a lot of good information about log of small numbers.
vignette(package = "Rmpfr", "log1mexp-note")
https://cran.r-project.org/web/packages/Rmpfr/vignettes/log1mexp-note.pdf
Regards
Martin M. S. Pedersen
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