Miscellany

require(quantmod)
y <- getFX('USD/JPY', from=Sys.Date()-499, auto.assign=F)
x <- index(y)
y.above <- y[as.vector(y) > mean(as.vector(y))]
y.below <- y[as.vector(y) < mean(as.vector(y))]
x.above <- x[as.vector(y) > mean(as.vector(y))]
x.below <- x[as.vector(y) < mean(as.vector(y))]
class(y.above)
class(y.below)
plot(y, type='n', main='US Dollar vs. Japanese Yen')
print(paste(length(x.below), length(y.below), sep=';'))
polygon(x.below,y.below, col='green')
polygon(x.above,y.above, col='red')