How to add a title to a ggplot when the title is a variable name?

Question

At the end of a ggplot, this works fine:

+ opts(title = expression(\"Chart chart_title...\"))

But this does not:

chart_titl         


        

Answer 1

ggtitle( paste( "The sum is =", mysum, "The Count is =", N ) )

mysum and N are variables