How to plot two charts with same X axis in R? -


how plot 2 charts using same x axis in r ggplot2?

i looking like: http://i.stack.imgur.com/b9qt7.png

the basic idea melt data set have values of variables want plot on y axis in single column, second column distinguishing source. example:

data("economics") dat.m <- melt(economics, measure.vars=c("pop", "unemploy")) 

then use facet_grid plot each variable in separate facet:

ggplot(dat.m, aes(x=date, y=value)) + geom_line() + facet_grid(variable~., scales="free_y") 

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