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] -28.803534 -24.179042 -19.554550 -14.930059 -10.305567  -5.681075
#>  [7]  -1.056583   3.567909   8.192401  12.816893
seq_range(x, n = 10, trim = 0.1)
#>  [1] -6.5128552 -5.3138121 -4.1147689 -2.9157258 -1.7166827 -0.5176396
#>  [7]  0.6814035  1.8804466  3.0794897  4.2785328
seq_range(x, by = 1, trim = 0.1)
#>  [1] -6.5128552 -5.5128552 -4.5128552 -3.5128552 -2.5128552 -1.5128552
#>  [7] -0.5128552  0.4871448  1.4871448  2.4871448  3.4871448

# Make pretty sequences
y <- runif(100)
seq_range(y, n = 10)
#>  [1] 0.008894111 0.117153441 0.225412771 0.333672101 0.441931431 0.550190761
#>  [7] 0.658450091 0.766709421 0.874968751 0.983228081
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] 0.008894111 0.108894111 0.208894111 0.308894111 0.408894111 0.508894111
#>  [7] 0.608894111 0.708894111 0.808894111 0.908894111
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