[R-sig-eco] R-sig-ecology Digest, Vol 145, Issue 1

[Valeria Valeria]

Good morning,I hope this email finds you well.I am looking for a copy of
the GEBCO Digital Atlas (GDA). General Bhatrimetric Chart of the Ocean. The
GEBCO Digital Atlas (GDA) was a two-volume DVD and CDROM set that contained
GEBCO's 30 arc-second interval global gridded bathymetric data set and
GEBCO Centenary release collection of bathymetric contours.
Is anyone has a copy of this or do you know where can I find it? I really
needed a copy of it.Thanks for you help.Best Regards,Valeria

On Wed, 1 Apr 2020 at 11:02, <r-sig-ecology-request using r-project.org> wrote:

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>    1. Function in Genetic Algorithms (Daniel =?ISO-8859-1?Q?Pat=F3n?=)
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 31 Mar 2020 16:06:04 +0200
> From: Daniel =?ISO-8859-1?Q?Pat=F3n?= <d.paton.d using gmail.com>
> To: R-sig-ecology using r-project.org
> Subject: [R-sig-eco] Function in Genetic Algorithms
> Message-ID: <20200331160604.05f908850e44f7fc5c96cc14 using gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> Dear colleagues:
>
> I'm trying to fit a model by Genetic Algorithms. In the GAFIT package the
> expression I use for fitting is:
>
> fitness <- expression((Z - (X^a + Y^b))^2)
>
> Y a and b are coefficients of the variables X and Y. Z is the output
> variable.
>
> When I try to use another package (rgenoud, GA, etc...) I must put the
> syntax in function form. I use this:
>
> fitness <- function(X,Y,Z) {
> Z <- trees$BIOMASS
> X <- trees$DIAMETER
> Y <- trees$HEIGHT
> observed <- (X + X^2 + Y + Y^2 + X*Y)
> expected <- Z
> error <- (observed-expected)^2
> return(error)
> }
>
> I don't know what I'm doing wrong.
>
> I'd appreciate a little help.
> Thank you
>
> --
>
> ****************************************************************************
>  Daniel Patón
>  Numerical Ecology. Ecology Unit
>  Department of Plant Biology, Ecology and Earth Sciences
>  Faculty of Sciences. University of Extremadura
>  Avda. Elvas s/n 06071 Badajoz (Spain)
>  https://orcid.org/0000-0003-2500-3964
>  https://cvn.fecyt.es/0000-0003-2500-3964
>  http://unex.academia.edu/DanielPatonDominguez
>  https://www.researchgate.net/profile/Daniel_Paton/
>  http://sites.google.com/site/numericalecologyuex/home
>  http://twitter.com/NumericalEcolo1
>  https://www.youtube.com/channel/UCcDUrzoZQ5OID6uVxhcwBng
>
>
>
>
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> End of R-sig-ecology Digest, Vol 145, Issue 1
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