vvelocity {dave} | R Documentation |
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).
vvelocity(pveg, timescale, y, ...)
vvelocity2(pveg, timescale, y=1)
## Default S3 method:
vvelocity(pveg,timescale,y,...)
## S3 method for class 'vvelocity'
plot(x,tlabs,scal=1,...)
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". |
See also pco
for the ordinations used.
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) |
Otto Wildi
Wildi, O. 2017. Data Analysis in Vegetation Ecology. 3rd ed. CABI, Oxfordshire, Boston.
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)