[R] data.frame, ggplot vs matplot
baptiste Auguié
ba208 at exeter.ac.uk
Tue Oct 30 21:22:05 CET 2007
Hello,
I've been trying to use ggplot, but I cannot seem to get my data in
the correct form. I usually have a vector x, and a matrix y and I
would usually use matplot(x,y) to plot the columns of y against x.
Now, if i understand correctly, I should cast x and y into a
data.frame and do something like ggplot(x,y,data=data). I think I'm
missing something here: do I really need to reshape y into a single
vector, replicate x accordingly, and put both vectors in a data frame?
I've tried it, but the reshape function is still very obscure to me.
Any help appreciated!
Small example:
x<-seq(from=1,by=1,length=10)
y<-sin(x)%*%t(x)
columns<-c(1:10)
matplot(x,y)
legend("topleft", "(x,y)", columns)
# the version below is not working
require(ggplot2)
data.frame(cbind(x,y))->dataS
wide <- reshape(dataS, direction="wide",timevar=c(1:length(columns)))
dataL<-reshape(wide,direction="long") # this clearly doesn't work as
I would have thought
qplot(x, y, data = dataL)
Best regards,
baptiste
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