Personal_Projects/BenchReturn.qmd at main · thomasqmd/Personal_Projects · GitHub

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---
title: "BenchReturn"
author: "ThomasReinke"
format: html
editor_options:
  chunk_output_type: console
---

```{r setup}
#| echo: false
#| include: false
knitr::opts_chunk$set(
  collapse = TRUE, comment = "#"
)
knitr::opts_chunk$set(tidy.opts = list(width.cutoff = 60), tidy = TRUE)

#source(here::here("helpers.R"))
library("tidyverse"); library("patchwork"); library("glue")
library("scales", warn.conflicts = FALSE); library("extrafont")
theme_set(theme_minimal())
theme_update(panel.grid.minor = element_blank())
```

## To return or not to return


### A function that simply returns true
```{r}
no_return <- function(n){
  TRUE
}
```
```{r}
yes_return <- function(n){
  return(TRUE)
}
```

```{r}
#| cache: true
# benchmark and plot results
res <- bench::press(
  n = c(1, 2),
  {
    bench::mark(
      yes_return(n),
      no_return(n)
    )
  }
)
res
plot(res)
```

### A function that copies and returns a matrix
```{r}
matrix_return <- function(A){
  B <- A
  return(B)
}
```
```{r}
matrix_no_return <- function(A){
  B <- A
  B
}
```
```{r}
#| cache: true
# benchmark and plot results
res <- bench::press(
  m = c(10, 20, 50, 100),
  {
    A <- matrix(rnorm(m^2), m) |> crossprod()
    bench::mark(
      matrix_no_return(A),
      matrix_return(A)
    )
  }
)
res
plot(res)
```

### Loops
```{r}
loop_return <- function(n){
  for(i in seq_along(1:n)){
    for(j in seq_along(1:n)){
      for(k in seq_along(1:n)){
        l <- i * j * k
      }
    }
  }
  return(l)
}
```
```{r}
loop_no_return <- function(n){
  for(i in seq_along(1:n)){
    for(j in seq_along(1:n)){
      for(k in seq_along(1:n)){
        l <- i * j * k
      }
    }
  }
  l
}
```
```{r}
#| cache: true
res <- bench::press(
  n = c(1, 10),
  {
    bench::mark(
      matrix_no_return(n),
      matrix_return(n)
    )
  }
)
res
plot(res)
```