Returns a random subset of observations/elements from vectors, matrices, and data frames.
Usage
some(x, n = 6L, ...)
# S3 method for class 'data.frame'
some(x, n = 6L, ...)
# S3 method for class 'matrix'
some(x, n = 6L, addrownums = TRUE, ...)
# Default S3 method
some(x, n = 6L, ...)Arguments
- x
An R object.
- n
Integer scalar specifying the number of elements or rows to return. Defaults to `6L`. Negative values reduce the total number of returned elements relative to the object size.
- ...
Additional arguments passed to methods.
- addrownums
Logical. Should artificial row names be added for matrices without row names? Only used for matrices.
Value
A random subset of `x`.
- For vectors: a vector. - For matrices: a matrix. - For data frames: a data frame.
Details
Negative values of `n` are interpreted as:
`length(x) + n`
or
`nrow(x) + n`
respectively.
This function is useful for quickly inspecting random parts of larger objects.
Examples
some(1:100)
#> [1] 23 31 45 47 63 76
some(letters, 10)
#> [1] "b" "d" "e" "f" "i" "k" "m" "o" "r" "w"
some(mtcars, 5)
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
#> Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
#> Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
#> Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
#> Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
some(as.matrix(mtcars), 4)
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Hornet 4 Drive 21.4 6 258 110 3.08 3.215 19.44 1 0 3 1
#> Valiant 18.1 6 225 105 2.76 3.460 20.22 1 0 3 1
#> Lincoln Continental 10.4 8 460 215 3.00 5.424 17.82 0 0 3 4
#> Maserati Bora 15.0 8 301 335 3.54 3.570 14.60 0 1 5 8
# Negative n
some(1:20, -5)
#> [1] 1 2 3 4 5 6 7 9 10 11 12 14 15 16 20