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-- Status: rewritten July 2018
-- Author: Lily Silverstein
doc///
Key
pack
(pack, BasicList, ZZ)
(pack, ZZ, BasicList)
(pack, String, ZZ)
(pack, ZZ, String)
Headline
pack elements of a list or string into several shorter lists or strings
Usage
pack(A, n)
pack(n, A)
Inputs
A: {BasicList,String}
n: ZZ
how many elements of {\tt A} to put in each new list or string
Outputs
L: List
a list of lists or strings, with the elements of {\tt A} taken {\tt n} at a time.
Description
Text
The commands {\tt pack(A, n)} and {\tt pack(n, A)} produce identical results.
Example
pack(a..l, 3)
pack(3, a..l)
pack("Hello world!", 4)
pack(4, "Hello world!")
Text
If {\tt n} doesn't divide the length of {\tt A}, the last list will have fewer
than {\tt n} elements.
Example
pack(a..m, 3)
Text
{\tt pack} and @TO mingle@ can be used together to take a transpose of lists
Example
pack(2, mingle(a..m, 0..12))
SeeAlso
mingle
sort
sublists
take
"lists and sequences"
///
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