Information Technology Reference
In-Depth Information
RayW
NumVes
400
60
30
600
25
50
800
500
160
20
O.por
1000
140
40
15
400
120
1200
500
450
400
O.bul
350
300
250
100
O.ken
30
1400
10
80
300
1600
5
60
20
1800
0
200
FibL
Figure 3.23
PCA biplot of the centred and scaled
Ocotea
data set disregarding the
species group structure. The mean vectors of the three species
O. bullata, O. porosa
and
O. kenyensis
have been interpolated into the biplot and are shown by the coloured and
appropriately labelled circles. If required, the individual sample points can be labelled
by setting
label = TRUE
in the function call described in the text.
PCAbipl(Ocotea.data[,3:8], scaled.mat = TRUE, X.new.samples =
newsamples, colours = "green", pch.samples = 15,
pch.samples.size = 1.2, label = FALSE, pos = "Paral", offset =
c(-0.2, 0.1, 0.1, 0), n.int = c(5,5,5,5,3,5), side.label =
c(rep("right",5),"left"), pos.m = c(4,4,4,4,4,2), offset.m =
c(-0.1, -0.1, 0.1, -0.1, -0.1, 0.1), pch.new = 16, pch.new.cols
= c("red","blue","cyan"), pch.new.labels = c("O.bul","O.ken",
"O.por"))
We draw attention to arguments
scaled.mat = TRUE
requesting the scaling of the
input matrix,
X.new.samples = newsamples
providing the data for the new samples,
side.label = c(rep("right",5), "left")
,
pos.m = c(4,4,4,4,4,2)
and
offset.m = c(-0.1, -0.1, 0.1, -0.1, -0.1, 0.1)
for
fine-tuning
the
cali-
brations on the respective axes.
