[R] math symbols and text with mtext()

[Juan Lewinger]

Dear R users,

Two questions:

1) Is there a way to simplify the mtext() line below ?

beta=c(1,-1)
m=5
plot(1)
mtext( bquote(paste( beta == .(paste( "(", paste(beta, collapse=", "), ")" )) )), outer=TRUE,line=-3)

2) How do I get the embedded carriage return "\n" below to work, i.e for the text that follows it to appear on the next line?

beta=c(1,-1)
m=5
plot(1)
mtext( bquote(paste( beta == .(paste( "(", paste(beta, collapse=", "), ") " )), 
                         "\n Expected # of true positives = ", .(m))), outer=TRUE, line=-3)

Thanks in advance! 

Juan Pablo Lewinger, Ph.D. 
Department of Preventive Medicine 
Keck School of Medicine 
University of Southern California