[R] RES: WIERD: Basic computing in R

Leandro Marino leandro at cesgranrio.org.br
Tue Jul 1 20:47:39 CEST 2008


the problem is what you want!

With the -2.7^8.6 you are doing -(2.7^8.6) it exists...

But, if you try (-2.7)^8.6 the R gives you NaN. When you define p=-2.7 and
q=8.6 and do p^q you are doing that (-2.7)^8.6.

If you write p=2.7 and q=8.6 and use the -p^q  it will work!

Leandro Marino

-----Mensagem original-----
De: r-help-bounces em r-project.org [mailto:r-help-bounces em r-project.org]Em
nome de Dirk Eddelbuettel
Enviada em: terca-feira, 1 de julho de 2008 15:19
Para: poolloopus em yahoo.com
Cc: r-help em r-project.org
Assunto: Re: [R] WIERD: Basic computing in R

On Tue, Jul 01, 2008 at 11:15:58AM -0700, poolloopus em yahoo.com wrote:
> Can someone please enlighten me as to why the following happens?
> > -2.7^8.6
> [1] -5125.407
> > p<- -2.7
> > q<- 8.6
> > p^q
> [1] NaN
> R seems perfectly able to calculate -2.7^8.6, but fails when the exact
same values are assigned to variables and then the computation is repeated.
> Thanks in advance for any suggetsions.



Three out of two people have difficulties with fractions.

R-help em r-project.org mailing list
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

More information about the R-help mailing list