Utilities for Developing R Software (original) (raw)

The oeli package offers a collection of handy functions that I found useful while developing R packages. Perhaps you’ll find them helpful too!

Installation

The released package version can be installed from CRAN via:

Demos

The package includes helpers for various tasks and objects. Some demos are shown below. Click the headings for reference pages with documentation on all available helpers in each category.

Distributions

The package has density and sampling functions for distributions not in base R, such as Dirichlet, multivariate normal, truncated normal, and Wishart.

ddirichlet(x = c(0.2, 0.3, 0.5), concentration = 1:3)
#> [1] 4.5
rdirichlet(concentration = 1:3)
#> [1] 0.1273171 0.5269401 0.3457428

For faster computation, Rcpp implementations are also available:

microbenchmark::microbenchmark(
  "R"    = rmvnorm(mean = c(0, 0, 0), Sigma = diag(3)),
  "Rcpp" = rmvnorm_cpp(mean = c(0, 0, 0), Sigma = diag(3))
)
#> Unit: microseconds
#>  expr   min     lq    mean median     uq    max neval
#>     R 200.5 208.25 263.396 217.10 234.35 2154.7   100
#>  Rcpp   2.7   2.90   5.386   4.05   4.40   72.0   100

Indexing helpers

Create all possible permutations of vector elements:

permutations(LETTERS[1:3])
#> [[1]]
#> [1] "A" "B" "C"
#> 
#> [[2]]
#> [1] "A" "C" "B"
#> 
#> [[3]]
#> [1] "B" "A" "C"
#> 
#> [[4]]
#> [1] "B" "C" "A"
#> 
#> [[5]]
#> [1] "C" "A" "B"
#> 
#> [[6]]
#> [1] "C" "B" "A"

Package helpers

Quickly have a basic logo for your new package:

package_logo("my_package", brackets = TRUE, use_logo = FALSE)

How to print a matrix without filling up the entire console?

x <- matrix(rnorm(10000), ncol = 100, nrow = 100)
print_matrix(x, rowdots = 4, coldots = 4, digits = 2, label = "what a big matrix")
#> what a big matrix : 100 x 100 matrix of doubles 
#>         [,1]  [,2]  [,3] ... [,100]
#> [1,]    2.39   0.3 -0.48 ...   0.56
#> [2,]   -1.33  0.62  0.37 ...  -1.21
#> [3,]   -0.03 -0.43  1.71 ...   0.07
#> ...      ...   ...   ... ...    ...
#> [100,]  0.14 -0.16  2.49 ...  -1.58

And what about a data.frame?

x <- data.frame(x = rnorm(1000), y = LETTERS[1:10])
print_data.frame(x, rows = 7, digits = 0)
#>      x  y
#> 1     0 A
#> 2    -1 B
#> 3     0 C
#> 4    -1 D
#> < 993 rows hidden >
#>          
#> 998  -1 H
#> 999  -1 I
#> 1000  0 J

Transformation helpers

The [group_data.frame()](reference/group%5Fdata.frame.html) function groups a given data.frame based on the values in a specified column:

df <- data.frame("label" = c("A", "B"), "number" = 1:10)
group_data.frame(df = df, by = "label")
#> $A
#>   label number
#> 1     A      1
#> 3     A      3
#> 5     A      5
#> 7     A      7
#> 9     A      9
#> 
#> $B
#>    label number
#> 2      B      2
#> 4      B      4
#> 6      B      6
#> 8      B      8
#> 10     B     10