Perm inv - Revision history

Nathaniel at 16:08, 29 September 2014

2014-09-29T16:08:55Z

← Older revision		Revision as of 16:08, 29 September 2014
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	\|desc=Computes the inverse of a permutation		\|desc=Computes the inverse of a permutation
	\|rel=[[perm_sign]]		\|rel=[[perm_sign]]
			\|cat=[[List of functions#Helper_functions\|Helper functions]]
	\|upd=November 28, 2012		\|upd=November 28, 2012
	\|v=1.00		\|v=0.50
	\|helper=1}}		\|helper=1}}
	<tt>'''perm_inv'''</tt> is a [[List of functions\|function]] that computes the [http://mathworld.wolfram.com/InversePermutation.html inverse of a permutation].		<tt>'''perm_inv'''</tt> is a [[List of functions\|function]] that computes the [http://mathworld.wolfram.com/InversePermutation.html inverse of a permutation].
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	===Small examples===		===Small examples===
	The identity permutation is its own inverse:		The identity permutation is its own inverse:
	<~~pre~~>		<syntaxhighlight>
	>> perm_inv(1:4)		>> perm_inv(1:4)

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	1 2 3 4		1 2 3 4
	</~~pre~~>		</syntaxhighlight>

	To compute the inverse of the permutation on [http://mathworld.wolfram.com/InversePermutation.html this MathWorld page], we can use the following line of code:		To compute the inverse of the permutation on [http://mathworld.wolfram.com/InversePermutation.html this MathWorld page], we can use the following line of code:
	<~~pre~~>		<syntaxhighlight>
	>> perm_inv([3,8,5,10,9,4,6,1,7,2])		>> perm_inv([3,8,5,10,9,4,6,1,7,2])

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	8 10 1 6 3 7 9 2 5 4		8 10 1 6 3 7 9 2 5 4
	</~~pre~~>		</syntaxhighlight>

			{{SourceCode\|name=perm_inv\|helper=1}}

Nathaniel at 17:14, 21 January 2013

2013-01-21T17:14:22Z

← Older revision		Revision as of 17:14, 21 January 2013
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	\|name=perm_inv		\|name=perm_inv
	\|desc=Computes the inverse of a permutation		\|desc=Computes the inverse of a permutation
			\|rel=[[perm_sign]]
	\|upd=November 28, 2012		\|upd=November 28, 2012
	\|v=1.00		\|v=1.00

Nathaniel: Created page with "{{Function |name=perm_inv |desc=Computes the inverse of a permutation |upd=November 28, 2012 |v=1.00 |helper=1}} `'''perm_inv'''` is a function th..."

2012-11-28T18:25:39Z

Created page with "{{Function |name=perm_inv |desc=Computes the inverse of a permutation |upd=November 28, 2012 |v=1.00 |helper=1}} <tt>'''perm_inv'''</tt> is a function th..."

New page

{{Function
|name=perm_inv
|desc=Computes the inverse of a permutation
|upd=November 28, 2012
|v=1.00
|helper=1}}
<tt>'''perm_inv'''</tt> is a [[List of functions|function]] that computes the [http://mathworld.wolfram.com/InversePermutation.html inverse of a permutation].

==Syntax==
* <tt>PI = perm_inv(PERM)</tt>

==Argument descriptions==
* <tt>PERM</tt>: A vector containing a permutation of the integers 1, 2, ..., n.

==Examples==
===Small examples===
The identity permutation is its own inverse:
<pre>
>> perm_inv(1:4)

ans =

1 2 3 4
</pre>

To compute the inverse of the permutation on [http://mathworld.wolfram.com/InversePermutation.html this MathWorld page], we can use the following line of code:
<pre>
>> perm_inv([3,8,5,10,9,4,6,1,7,2])

ans =

8 10 1 6 3 7 9 2 5 4
</pre>

Perm inv - Revision history

Nathaniel at 16:08, 29 September 2014

Nathaniel at 17:14, 21 January 2013

Nathaniel: Created page with "{{Function |name=perm_inv |desc=Computes the inverse of a permutation |upd=November 28, 2012 |v=1.00 |helper=1}} '''perm_inv''' is a function th..."

Nathaniel: Created page with "{{Function |name=perm_inv |desc=Computes the inverse of a permutation |upd=November 28, 2012 |v=1.00 |helper=1}} `'''perm_inv'''` is a function th..."