Name

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  CMPRODUCT

Author

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  Craig B. Markwardt, NASA/GSFC Code 662, Greenbelt, MD 20770
  craigm@lheamail.gsfc.nasa.gov

Purpose

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  CMPRODUCT() is the multiplicative equivalent of TOTAL().

Calling Sequence

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  Result = CMPRODUCT(ARRAY)

Description

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  Calculates the product of all the elements of an array. Vector
  multiplication in groups of powers of two make this operation
  faster than a simple FOR loop. The number of actual
  multiplications is still N_ELEMENTS(ARRAY). Double precision
  should be used for the highest accuracy when multiplying many
  numbers.

Inputs

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  ARRAY - Array of elements to multiply together. For instance,
          ARRAY could contain the dimensions of another array--then
          CMPRODUCT(ARRAY) would be the total number of elements of
          that other array.

Returns

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  The result of the function is the total product of all the elements
  of ARRAY.

Example

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See Also

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  TOTAL, PRODUCT (from Astronomy User's Library)

Modification History

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  Written, CM, 28 Mar 2000
    (based on outline of PRODUCT by William Thompson)