mafragh {ade4}R Documentation

Phyto-Ecological Survey

Description

This data set gives environmental and spatial informations about species and sites.

Usage

data(mafragh)

Format

mafragh is a list of 6 components.

    xy
    are the coordinates of 97 sites.
    flo
    is a data frame with 97 sites and 56 species.
    espnames
    is a vector of the names of species.
    neig
    is the neighbourhood graph of the 97 sites (an object of class 'neig').
    mil
    is a data frame with 97 sites and 11 environmental variables.
    partition
    is a factor classifying the 97 sites in 5 classes.

Source

Belair, G.d. and Bencheikh-Lehocine, M. (1987)
Composition et déterminisme de la végétation d'une plaine côti"re marécageuse : La Mafragh (Annaba, Algérie).
Bulletin d'Ecologie, 18, 393–407.

Examples

data(mafragh)
par(mfrow = c(3,2))
s.label(mafragh$xy, inc = FALSE, neig = mafragh$neig, 
    sub = "Samples & Neighbourhood graph")
coa1 <- dudi.coa(mafragh$flo, scan = FALSE)
s.value(mafragh$xy, coa1$li[,1], sub = "Axis 1 - COA")
pca1 <- dudi.pca(mafragh$xy, scan = FALSE)
s.value(mafragh$xy, pca1$li[,1], sub = "Axis 1 - PCA")
s.class(pca1$li, mafragh$partition, sub = "Plane 1-2 - PCA")
s.class(coa1$li, mafragh$partition, sub = "Plane 1-2 - COA")
s.chull(mafragh$xy, mafragh$partition, optchull = 1)

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