Rounding of Small Numbers — round

Rounding of a number smaller than specified precision doesn't coerce to 0.

Usage

round_small(x, method = c("round", "signif"), digits = 3, sci = FALSE)

Arguments

x: a numeric vector or matrix
method: use either round() or signif() as rounding method
digits: integer indicating number of decimal places to round to
sci: if TRUE, scientific notation is used

Value

If precision of number is larger than desired rounding, the default round is used. Otherwise, we provide an upper bound instead of coercion to 0.

Details

This function is useful when we have small p-values and don't want to show the scientific notation, or coercion to 0. Instead we show an upper bound. For example, if a p-value is 2e-05 and we want to round to 3 digits, the function will return "< 0.001".

Author

Derek Chiu

Examples

# Vector inputs
round_small(2e-04)
#> [1] "< 0.001"
round_small(5e-04)
#> [1] "< 0.001"
round_small(6e-04)
#> [1] 0.001

# Matrix input
set.seed(12)
x <- matrix(rexp(25, 3), nrow = 5)
round_small(x, digits = 1)
#>      [,1]    [,2]  [,3]  [,4]  [,5] 
#> [1,] "0.7"   "0.1" "0.4" "0.7" "0.3"
#> [2,] "0.2"   "1.3" "0.4" "0.9" "0.2"
#> [3,] "< 0.1" "1.4" "0.3" "0.1" "0.1"
#> [4,] "1"     "0.4" "0.3" "0.5" "0.2"
#> [5,] "0.6"   "0.2" "0.1" "0.6" "0.4"