Generate sequence in a safe way

The zeq() function creates an increasing integer sequence, but differs from the standard one in that it will not silently generate a decreasing sequence when the second argument is smaller than the first. If the second argument is one smaller than the first it will generate an empty sequence, if the difference is greater, the function will throw an error.

Usage

zeq(from, to)

Arguments

from

The lower bound of the sequence

to

The higher bound of the sequence

Value

A sequence ranging from from to to

Examples

# For increasing sequences, zeq() and seq() are identical
zeq(11,15)
#> [1] 11 12 13 14 15
zeq(11,11)
#> [1] 11

# If second argument equals first-1, an empty sequence is returned
zeq(11,10)
#> numeric(0)

# If second argument is less than first-1, the function throws an error
tryCatch(zeq(11,9), error=wrap_error)
#> #E> to >= from - 1 is not TRUE