Generate a sequence over the range of a vector

Usage

seq_range(x, n, by, trim = NULL, expand = NULL, pretty = FALSE)

Arguments

x

A numeric vector

n, by

Specify the output sequence either by supplying the length of the sequence with n, or the spacing between value with by. Specifying both is an error.

I recommend that you name these arguments in order to make it clear to the reader.

trim

Optionally, trim values off the tails. trim / 2 * length(x) values are removed from each tail.

expand

Optionally, expand the range by expand * (1 + range(x) (computed after trimming).

pretty

If TRUE, will generate a pretty sequence. If n is supplied, this will use pretty() instead of seq(). If by is supplied, it will round the first value to a multiple of by.

Examples

x <- rcauchy(100)
seq_range(x, n = 10)
#>  [1] -69.606705 -50.710825 -31.814944 -12.919064   5.976817  24.872698
#>  [7]  43.768578  62.664459  81.560340 100.456220
seq_range(x, n = 10, trim = 0.1)
#>  [1] -9.12235862 -7.61545533 -6.10855205 -4.60164876 -3.09474548
#>  [6] -1.58784219 -0.08093891  1.42596438  2.93286766  4.43977095
seq_range(x, by = 1, trim = 0.1)
#>  [1] -9.1223586 -8.1223586 -7.1223586 -6.1223586 -5.1223586 -4.1223586
#>  [7] -3.1223586 -2.1223586 -1.1223586 -0.1223586  0.8776414  1.8776414
#> [13]  2.8776414  3.8776414

# Make pretty sequences
y <- runif(100)
seq_range(y, n = 10)
#>  [1] 0.01139899 0.12047311 0.22954724 0.33862136 0.44769548 0.55676960
#>  [7] 0.66584373 0.77491785 0.88399197 0.99306610
seq_range(y, n = 10, pretty = TRUE)
#>  [1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
seq_range(y, n = 10, expand = 0.5, pretty = TRUE)
#>  [1] -0.4 -0.2  0.0  0.2  0.4  0.6  0.8  1.0  1.2  1.4

seq_range(y, by = 0.1)
#>  [1] 0.01139899 0.11139899 0.21139899 0.31139899 0.41139899 0.51139899
#>  [7] 0.61139899 0.71139899 0.81139899 0.91139899
seq_range(y, by = 0.1, pretty = TRUE)
#>  [1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0