R type conversion [removed]) function()

Question

I\'ve been trying to write a program in R that implements Newton\'s method. I\'ve been mostly successful, but there are two little snags that have been bothering me. Here\'s m

Answer 1

Josh has answered your question

For part 2 you could have used

g <- expression( sin(x) )

g[[1]]
# sin(x)

f <- function(x){ eval( g[[1]] ) }

f(0)
# [1] 0
f(pi/6)
# [1] 0.5