Generates environmental variables

Generates environmental variables used for generating species abundances. Environmental variables may be correlated, and may follow different distributions.

Usage

make.env(n, elen, emean, edistr, ecor, ndim)

Arguments

n

Number of samples to be generated.

elen

Range of the environmental variables. Single number or vector of length ndim.

emean

Mean of the environmental variables. Single number or vector of length ndim.

edistr

Distribution of the environmental variables. Currently 'uniform' and 'Gaussian' are supported.

ecor

Correlation matrix of the environmental variables supplied by user. Object generated by cor.mat.fun. If omitted environmental variables are not correlated.

ndim

Number of environmental variables to generate.

Value

Matrix of environmental variables. n rows and ndim columns.

References

Minchin, P.R. (1987) Multidimensional Community Patterns: Towards a Comprehensive Model. Vegetatio, 71, 145-156.

Author

Mathias Trachsel and Richard J. Telford

See also

cor.mat.fun

Examples

env.vars <- make.env(100,elen =rep(100,10),emean = rep(50,10), edistr ='uniform',ndim = 10)