speedprof {dave} | R Documentation |
From a multivariate time series of vegetation data this first computes a distance matrix (vegdist
, euclidean). The first plot is a graphical representation of the full distance matrix, the second a profile of change per time step of different length (velocity).
speedprof(veg, timescale, orders, y = 1, adjust,...)
speedprof2(veg, timescale, orders, y = 1, adjust)
## Default S3 method:
speedprof(veg, timescale, orders, y = 1, adjust,...)
## S3 method for class 'speedprof'
plot(x,...)
veg |
This is a vegetation data frame, releves are rows, species columns. Releves are considered a time series. |
timescale |
A vector of points in time of releves (rows) |
orders |
Orders used for printing the velocity profile, i.e., the number of time steps used for calculating speed (rate of change per time unit). |
y |
Transformation of species scores: x'= x exp(y) |
adjust |
Parameter adjust=TRUE re-scales releves to vector sum=100 percent (assuming cover |
x |
An object of class "speedprof". |
... |
Parameter out.seq, the plotting interval |
An object of class "SNPsm" with at least the following items:
nrel |
The number of releves |
dmatrix |
The distance matrix |
timescale |
The time scale |
orders |
Time step lengths considered for plotting the profile |
Otto Wildi
Wildi, O. 2017. Data Analysis in Vegetation Ecology. 3rd ed. CABI, Oxfordshire, Boston.
orders<- c(1,2,3,4)
o.spp<- speedprof(tveg,tsit$Year,orders,y=1.0,adjust=TRUE)
plot(o.spp)