Bioequivalence and Bioavailability Forum • implicit return?

implicit return? [R for BE/BA]

posted by Helmut – Vienna, Austria, 2019-04-28 18:50 – Posting: # 20257
Views: 1,548

Dear Detlew,

» » I always use explicit return(something) in my functions,…
»
» A good idea.

Yep.

» But if you use R you are told that doing so has the penalty of a longer run-time.
» Bloody Hell!

Does that really matter?

library(microbenchmark)

impl <- function(x) {

  if (x == 0) {

    "foo"

  } else {

    "bar"

  }

}

expl <- function(x) {

  if (x == 0) {

    return("foo")

  } else {

    return("bar")

  }

}

res <- microbenchmark(impl(round(runif(1), 0)),

                      expl(round(runif(1), 0)), times=2000L)

print(res)



Unit: microseconds

                     expr   min    lq     mean median    uq      max neval cld

 impl(round(runif(1), 0)) 1.811 1.812 2.686167  1.813 2.114 1383.479  2000   a

 expl(round(runif(1), 0)) 1.811 1.812 2.955002  1.813 2.114 1879.152  2000   a

» Weakly typed (R) against strong typed language (C or C++).

Exactly. You know that I’m facing a similar story with the forum scripts (PHP: weakly typed) generating database-queries (SQL: strongly typed). Bloody scavenger hunt.

—
Cheers,
Helmut Schütz

The quality of responses received is directly proportional to the quality of the question asked. ☼
Science Quotes

Complete thread:

R Inferno Helmut 2019-04-26 16:03 [R for BE/BA]
- full conditions! mittyri 2019-04-26 16:20
  - full conditions! Helmut 2019-04-26 16:41
  - full conditions! d_labes 2019-04-27 14:29
    - magik of R implicit return mittyri 2019-04-27 22:23
      - magik of R implicit return ElMaestro 2019-04-27 22:34
        
        implicit return? d_labes 2019-04-28 19:36
        
        implicit return? ElMaestro 2019-04-28 20:36
        implicit return? Helmut 2019-04-28 20:50
        
        implicit return? ElMaestro 2019-04-28 21:16
        
        implicit return? Helmut 2019-04-28 23:38
        
        implicit return? ElMaestro 2019-04-29 09:40
        
        implicit return? Helmut 2019-04-29 10:41
        
        implicit return? ElMaestro 2019-04-29 12:55
        
        built-in ifelse mittyri 2019-04-30 13:05