Evaluate expr with bquote .() substitution.
Including .(-x) promoting x's value from character to a name,
which is called "quote negation" (hence the minus-sign).
evalb(expr, where = parent.frame())
| expr | expression to evaluate. |
|---|---|
| where | environment to work in. |
evaluated substituted expression.
if(requireNamespace('graphics', quietly = TRUE)) { angle = 1:10 variable <- as.name("angle") fn_name <- 'sin' evalb( plot(x = .(variable), y = .(-fn_name)(.(variable))) ) }