[spark] R multiline and charting bug

so, if I execute this

w1 <- read.csv(file="/Users/enrico/Downloads/w1.dat",sep=",",head=TRUE)
cat(w1$vals)

the result is fine: https://www.dropbox.com/s/k12oz9oy2s7pwy1/Screenshot%202015-08-12%2012.38.56.png?dl=0

switching to this:

w1 <- read.csv(file="/Users/enrico/Downloads/w1.dat",sep=",",head=TRUE)
stripchart(w1$vals,method="stack",
main='Leaf BioMass in High CO2 Environment',
xlab='BioMass of Leaves')

notice the command on multiple lines. this doesn't work, it goes in an infinite 'running' status
then, if you switch to

w1 <- read.csv(file="/Users/enrico/Downloads/w1.dat",sep=",",head=TRUE)
stripchart(w1$vals,method="stack", main='Leaf BioMass in High CO2 Environment', xlab='BioMass of Leaves')

the results is psuedo-fine: the chart is correct, but it goes it hangs on status 'running' https://www.dropbox.com/s/3dmyntw8moh98oo/Screenshot%202015-08-12%2012.41.49.png?dl=0

and finally this

w1 <- read.csv(file="/Users/enrico/Downloads/w1.dat",sep=",",head=TRUE)
%stripchart(w1$vals,method="stack", main='Leaf BioMass in High CO2 Environment', xlab='BioMass of Leaves')

simply returns a

{"status": -1, "message": "'text/plain'"}