Perm inv
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| perm_inv | |
| Computes the inverse of a permutation | |
| Other toolboxes required | none |
|---|---|
| Related functions | perm_sign |
| Function category | Helper functions |
| This is a helper function that only exists to aid other functions in QETLAB. If you are an end-user of QETLAB, you likely will never have a reason to use this function. |
perm_inv is a function that computes the inverse of a permutation.
Syntax
- PI = perm_inv(PERM)
Argument descriptions
- PERM: A vector containing a permutation of the integers 1, 2, ..., n.
Examples
Small examples
The identity permutation is its own inverse:
>> perm_inv(1:4)
ans =
1 2 3 4To compute the inverse of the permutation on this MathWorld page, we can use the following line of code:
>> perm_inv([3,8,5,10,9,4,6,1,7,2])
ans =
8 10 1 6 3 7 9 2 5 4Source code
Click on "expand" to the right to view the MATLAB source code for this function.