JCL Help:Permutation
JCL Help: Permutation Function
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Summary
Returns nPr. i.e. permutation of R objects from N.
Pascal
function Permutation(N: Cardinal; R: Cardinal): Float;
Parameters
| Parameters | Description |
| N: Cardinal | N is the total number of available items, from which R items will be taken at a time. N must be greater than R but cannot exceed the value of the MaxFactorial constant or 0 will be returned. |
| R: Cardinal | R is the number of items that will be selected at a time from N total items. R must be smaller than or equal to N. |
Return Value
If the above mentioned constraints are met the permutation of R objects from N is returned or 1.0 if R = 0.0.
Description
Permutation returns nPr, i.e. permutation of R objects from N. Note: N must be greater than 0, R must be smaller than or equal to N and N must be smaller than the global constant MaxPermutation (1754 when Float is Extended), otherwise the function returns 0. A permutation is the number of unique ways you can organize R items taken from a pool of N items. For example, [Red, Blue, Green] is not the same permutation as [Green, Blue, Red].
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