Hi
I'm trying to scale the point symbols on a 3d plot so that the ones at the
front are larger than the ones at the back. I'm trying to give the image some
perspective.
Given this code...
library(scatterplot3d)
data=array(c(0,5,9), c(3,3))
scatterplot3d(data, pch=19, cex.symbols=10-data[,2],
color=c("red","blue","black"));
> data
[,1] [,2] [,3]
[1,] 0 0 0
[2,] 5 5 5
[3,] 9 9 9
which gives a vector for cex.symbols as
> 10-data[,2]
[1] 10 5 1
I would expect the largest point to be the red one at the origin but
the image I get has the black symbol at co-ords 9,9,9 as the largest and red at
0,0,0 the smallest.
Then if I do...
> data=array(c(0,9,5), c(3,3))
> data
[,1] [,2] [,3]
[1,] 0 0 0
[2,] 9 9 9
[3,] 5 5 5
> scatterplot3d(data, pch=19, cex.symbols=10-data[,2],
> color=c("red","blue","black"));
> 10-data[,2]
[1] 10 1 5
I'd expect the position and size of the points to be the same but the colour of
blue and black to be exchanged. But the size of the points also changes such
that the red point at 0,0,0 is the medium size and the black at 5,5,5 is the
smallest.
So is it possible to get the points described by each row in data to be scaled
by the values in data[,2]?
Many thanks
John
> sessionInfo()
R version 2.11.1 (2010-05-31)
i386-redhat-linux-gnu
locale:
[1] LC_CTYPE=en_US.utf8 LC_NUMERIC=C
[3] LC_TIME=en_US.utf8 LC_COLLATE=en_US.utf8
[5] LC_MONETARY=C LC_MESSAGES=en_US.utf8
[7] LC_PAPER=en_US.utf8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.utf8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] scatterplot3d_0.3-30
loaded via a namespace (and not attached):
[1] tools_2.11.1
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