Name

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    COMBIGEN

Purpose

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    Generates all possible combinations n-choose-k.

Category

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    Math

Calling Sequence

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    Result = COMBIGEN(N, K)

Inputs

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    N: Maximum number.
    K: Number of elements in each combination.

Outputs

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    Returns a M x K array of all K-length combinations of numbers from 0 to N-1.

Example

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    Generate all combinations 5-choose-3:
    IDL> print, combigen(5,3)
          0 0 0 0 0 0 1 1 1 2
          1 1 1 2 2 3 2 2 3 3
          2 3 4 3 4 4 3 4 4 4

Modification History

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    Written by Jeremy Bailin
    1 April 2011 Initial writing.