range
Creates a range structure.
Syntax

range(a[, b[, k]])

a
,b
, andk
are integers

Description
If a
, b
, and k
are integers, then range(a, b, k)
returns the structure
from: a to: b step: k
of type IntRange
.
If omitted, b
defaults to a
, and k
to 1
, so that range(a, b)
returns
from: a to: b step: 1
and range(a)
returns
from: a to: a step: 1.
IntRange
structures are used as input to some function, notably part
, and specify ranges of indices. Typically, if a ≤ b
, then range(a, b)
means all indices from a
to b
(inclusively), so that range(a)
means the single index a
. Indices typically can be given both as positive numbers (counting from the first index) or as negative numbers (counting from the last index), and if b
denotes an index preceding a
, then part(a, b)
denotes the indices from b
to a
in reverse order. If step > 1
, only every step
th index will be included. Usually, it doesn’t make sense for step
to be nonpositive.
See part
for examples.