Please do read the help for cbind(). 'iris' is a data frame, and you
created a matrix. Most likely you intended
iris.bind <- data.frame(x = iris.sub.pca$x, Species = iris$Species)
On 29/09/2013 01:06, Guy Wachsman wrote:
Hi all,
I was doing a PCA o the iris data set but when trying to rbind the "Species" column back
from the original data set, it turned into 1:3 integers instead of the original ones. I noticed
that the original names of the species are of type "integer", but I don't understand why,
and how to put them back with the name. That might be important if you have more than 3 species.
Then when I plotted I got an error message, here are the codes:
works, but the species name has changed into 1,2,3:
clrs <- c('red','green','blue')
iris.sub=subset(iris, select=-Species)
iris.sub.pca <- prcomp(iris.sub, center=T, retx=T)
iris.bind=cbind(iris.sub.pca$x, iris$Species)
plot(data=iris.bind, PC2~PC1, asp=1, pch=16, xlab='PC1',
ylab='PC2',xlim=c(-5,5),ylim=c(-5,5), col = clrs[iris$Species] )
If I plot like this:
plot(iris.bind$x[,1], iris.bind$x[,2],asp=1,pch=16, xlab='PC1',
ylab='PC2',xlim=c
(-5,5),ylim=c(-5,5), col = clrs[iris$Species] )
I get this error message
Error in iris.bind$x : $ operator is invalid for atomic vectors
Thanks a lot,
Guy
--
Guy Wachsman
Benfey lab, FFSC #4131, Duke
130 Science Drive
27708, Durham, NC
email: g...@duke.edu
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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