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```Statistics::Basic::VecUser3Contributed Perl DocumeStatistics::Basic::Vector(3)

NAME
Statistics::Basic::Vector - a class for handling	lists of numbers

SYNOPSIS
Invoke it this way:

my \$vector	   = vector(1,2,3);
my \$same_vector = vector(\$vector);
my \$different   = \$vector->copy;

This module tracks which	of the other Statistics::Basic modules use it.
That's it's primary purpose.  Although, it does also have overloads to
print the vectors in a pretty fashion.

print "\$vector\n"; #	pretty printed

METHODS
new()
The constructor can take a single array ref or a single
Statistics::Basic::Vector as	its argument.  It can also take	a list
of values.

It returns a	Statistics::Basic::Vector object.

If given a vector object argument, this function will return	the
argument rather than	creating a new vector.	This mainly used by
the other Statistics::Basic modules to try to prevent duplicate
calculations.

A vector's max size is set to the size of the argument or list on
initialization.

Note: normally you'd	use the	vector() constructor, rather than
building these by hand using	"new()".

copy()
Creates a new vector	object with the	same contents and size as this
one and returns it.

my \$v1 =	vector(3,7,9);
my \$v2 =	\$v1->copy(); # \$v2 is a	new object, separate vector
my \$v3 =	vector(\$v1); # \$v3 is the same object as \$v1

insert()
Insert new values into the vector.  If the vector was already full
(see	"set_size()"), this will also shift oldest elements from the
vector to compensate.

\$vector->insert(	4, 3 );	# insert a 3 and a 4

This	function returns the object itself, for	chaining purposes.

append()	ginsert()
Insert new values into the vector.  If the vector was already full
(see	"set_size()"), these functions will grow the size of the
vector to accommodate the new values, rather	than shifting things.
"ginsert()" does the	same thing.

\$vector->append(	4, 3 );	# append a 3 and a 4

This	function returns the object itself, for	chaining purposes.

query()
"query()" returns the contents of the vector	either as a list or as
an arrayref.

my @copy_of_contents	 = \$vector->query;
my \$reference_to_contents = \$vector->query;

Note	that changing the \$reference_to_contents will not usefully
affect the contents of the vector itself, but it will adversely
affect any computations based on the	vector.	 If you	need to	change
the contents	of a vector in a special way, use a

Keeping \$reference_to_contents available long term should work
acceptably (since it	refers to the vector contents itself).

query_filled()
Returns true	when the vector	is the same size as the	max size set
by "set_size()".  This function isn't useful	unless operating under
the effects of the nofill setting.

query_size()
Returns the current number of elements in the vector	object (not
the size set	with "set_size()").  This is almost never false	unless
you're using	the nofill setting.

set_size()
Sets	the max	size of	the vector.

my \$v1 =	vector(1,2,3);
\$v1->set_size(7); # [0, 0, 0,	0, 1, 2, 3]

Unless nofill is set, the vector will be filled with	0s (assuming
the vector wouldn't otherwise be full) on the oldest	side of	the
vector (so an insert	will push off one of the filled-zeros).

This	function returns the object itself, for	chaining purposes.

my \$v1 =	vector(2 .. 5)->set_size(5);
# [0, 2,	3, 4, 5]

set_vector()
Given a vector or array ref,	this will set the contents (and	size)
of the input	vector to match	the argument.  If given	a vector
object argument, this will make the two vectors match, while	still
remaining separate objects.

my \$v1 =	vector(3,7,9);
my \$v2 =	vector()->set_vector(\$v1);
my \$v3 =	vector(\$v1); # \$v3 is the same object as \$v1

This	function returns the object itself, for	chaining purposes.

This object is overloaded.  It tries to return an appropriate string
for the vector and raises errors	in numeric context.

In boolean context, this	object is always true (even when empty).

AUTHOR
Paul Miller "<jettero@cpan.org>"