This R package provides helper functions I found useful when developing R code - perhaps you will too! The released package version can be installed via:
install.packages("oeli")The following shows some demos. Click the headings for references on all available helpers in each category.
The package has density and sampling functions for some distributions not included in base R, like the Dirichlet:
ddirichlet(x = c(0.2, 0.3, 0.5), concentration = 1:3)
#> [1] 4.5
rdirichlet(concentration = 1:3)
#> [1] 0.3736202 0.2714344 0.3549454For 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 133.594 136.599 154.11343 139.2575 144.7405 1272.113 100
#> Rcpp 1.690 1.927 2.34702 2.3235 2.5915 7.290 100Retrieving default arguments of a function:
f <- function(a, b = 1, c = "", ...) { }
function_defaults(f)
#> $b
#> [1] 1
#>
#> $c
#> [1] ""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"Quickly have a basic logo for your new package:
logo <- package_logo("my_package", brackets = TRUE)
print(logo)
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,] -0.68 -1.99 -0.89 ... 0.65
#> [2,] 1.27 0.28 -1.35 ... 0.79
#> [3,] -1.27 -1.87 0.57 ... -0.52
#> ... ... ... ... ... ...
#> [100,] 2.02 0.27 -0.7 ... -1.59And 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 -1 A
#> 2 -1 B
#> 3 -1 C
#> 4 1 D
#> <993 rows hidden>
#>
#> 998 -1 H
#> 999 1 I
#> 1000 0 JLet’s simulate a Markov chain:
Gamma <- sample_transition_probability_matrix(dim = 3)
simulate_markov_chain(Gamma = Gamma, T = 20)
#> [1] 2 3 3 3 3 3 3 3 1 2 2 2 2 2 2 2 2 2 3 2The group_data.frame() 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 10Is my matrix a proper transition probability matrix?
matrix <- diag(4)
matrix[1, 2] <- 1
check_transition_probability_matrix(matrix)
#> [1] "Must have row sums equal to 1"