Generate a sequence over the range of a vector

Generate a sequence over the range of a vector

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] -34.949074 -21.837823  -8.726572   4.384679  17.495931  30.607182
#>  [7]  43.718433  56.829684  69.940935  83.052187
seq_range(x, n = 10, trim = 0.1)
#>  [1] -6.47023804 -4.84759965 -3.22496126 -1.60232287  0.02031551  1.64295390
#>  [7]  3.26559229  4.88823068  6.51086907  8.13350746
seq_range(x, by = 1, trim = 0.1)
#>  [1] -6.470238 -5.470238 -4.470238 -3.470238 -2.470238 -1.470238 -0.470238
#>  [8]  0.529762  1.529762  2.529762  3.529762  4.529762  5.529762  6.529762
#> [15]  7.529762

# Make pretty sequences
y <- runif(100)
seq_range(y, n = 10)
#>  [1] 0.003709545 0.113536504 0.223363462 0.333190420 0.443017378 0.552844336
#>  [7] 0.662671295 0.772498253 0.882325211 0.992152169
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] 0.003709545 0.103709545 0.203709545 0.303709545 0.403709545 0.503709545
#>  [7] 0.603709545 0.703709545 0.803709545 0.903709545
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