Just wanted to create an expression, existing of some mathematical annotation and a value of an R object. Wasn’t that intuitive!
Each single goal is easy to reach, for example to combine a value of an R object with text just use
To have a plot title with an you can use
But to let the the title of a plot contain objects and Greek letters isn’t that easy. Those of you who think it’s just about combining
expression might try it on their own and come back head-ached after few minutes of unsuccessful testings.
The problem is, that
expression interprets chars as expression and not as object identifier, of course, how should it know whether you mean the var
alpha or the Greek letter!? The solution is called
substitute ! With
substitute you can replace objects inline, here is a small example:
substitute got a list what to substitute and replaces the
paste with the content of
var . Run
eval to evaluate to result:
Now it’s easy to create a more complex plot title:
Go out and produce imposing graphs! (-;