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()

Getting Started with Image Segmentation using Mask R-CNN

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

eval(c)

"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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I come from Northwestern University, which is ranked 9th in the US. Although the high-quality academics at school taught me all the basics I needed, obtaining practical experience was a challenge.... Read More

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