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Last data update: 2014.03.03

R: Printing ordinations of velocity and acceleration and...

vvelocity

R Documentation

Printing ordinations of velocity and acceleration and differently transformed speed profiles

Description

Given a data frame of a multivariate (vegetation) time series this plots a pco ordination using circles with diameters proportional to rate of change (velocity), a pco ordination pco using cirlces with diameters proportional to change in velocity (acceleration) and three velocity profiles with differently transformed species scores (from quantitative to qualitative).

Usage

vvelocity(pveg, timescale, y, ...)
vvelocity2(pveg, timescale, y=1)

## Default S3 method:
vvelocity(pveg,timescale,y,...)
## S3 method for class 'vvelocity'
plot(x,...,tlabs=c(1),scal=1)

Arguments

`pveg`	A data frame of a multivariate (vegetation) time series
`timescale`	A vector of points in time of releves (rows)
`y`	Transformation of species scores: x'= x exp(y)
`...`	Additional arguments passed to plot.
`tlabs`	A vector of releve labels used for annotation of data points in ordinations. See example.
`scal`	A variable for scaling the circles in the ordinations. Default is scal=1.
`x`	An object of class "vvelocity".

Value

An object of class "vvelocity" with at least the following items:

`pveg`	The input vegetation data frame
`timescale`	The input time scale
`y`	Transformation of species scores: x'= x exp(y)

Author(s)

Otto Wildi

References

Wildi, O. 2013. Data Analysis in Vegetation Ecology. 2nd ed. Wiley-Blackwell, Chichester.

Examples

tlabs<- c(1,15,48,60,100,122,145)
timescale<- psit$Years.B.P
o.vvel<- vvelocity(pveg,timescale,y=0.5)
plot(o.vvel,tlabs=tlabs,scal=1)