Replacing an if statement's condition character with a variable

Question

This is probably an easy one.

In R, can I replace an if condition character (such as >) with a character and execute the if statement with it?

For example, if the if statement is:

ifelse(1 < 2, "T", "F")

But I'm getting the > condition character through a variable:

cc <- ">"

How would I write:

ifelse(1 < 2, "T", "F")

replacing < with cc?

Very close to https://stackoverflow.com/questions/55807468/evaluate-different-logical-conditions-from-string-for-each-row/ since all answers there can be applied here. — Ronak Shah, Apr 26 '19 at 01:32

score 2 · Accepted Answer · answered Apr 26 '19 at 00:56

As it is a relational operator in R, we can use match.fun

cc <- "<"
ifelse(match.fun(cc)(1, 2), "T", "F")
#[1] "T"

This ifelse can be simplified but I assume this is just an example and you want to do something more complicated.

You can also get the required output using eval(parse.. but I would not recommend it

ifelse(eval(parse(text = paste(1, cc, 2))), "T", "F")
#[1] "T"

1 Answers1