What is eval function in R?

What is eval function in R?

What is eval function in R?

This recipe explains what is eval function in R


Recipe Objective

What is eval () function in R? An eval () function evaluates the input value and returns an output result. The evaluate function is mostly applied over an expression. The eval function returns an error when given a a non-existent data object as input. This recipe gives an example on how to use an eval()

Step 1 - Define a vector

a <- 58 b <- 63 c <- expression(a+b)

Step 2 - Apply eval()

eval() returns the result of the input expression

"Output of the code returns" : 121

Step 3 - Define a vector (string)

For string objects, parse () has to be passed along with the eval() for getting the output of the expression.

a <- "58" b <- "53" eval(parse(text="58+63"))
"Output of the code is : " 121 

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