Name

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  MGH_NULL

Purpose

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  This function defines a null value for each IDL data type.

Calling Sequence

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  result = MGH_NULL(template)
  result = MGH_NULL(TYPE=type)

Positional Parameters

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  template (input, any type & size)
    If this argument is present, then the null value assumes its type.

Keyword Parameters

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  TYPE (input, numeric scalar)
    This keyword is used to specify the null value's type via IDL's
    type specifiers.

Return Value

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  The function returns a scalar null value.
###########################################################################
  This software is provided subject to the following conditions:
  1. NIWA makes no representations or warranties regarding the
    accuracy of the software, the use to which the software may
    be put or the results to be obtained from the use of the
    software. Accordingly NIWA accepts no liability for any loss
    or damage (whether direct of indirect) incurred by any person
    through the use of or reliance on the software.
  2. NIWA is to be acknowledged as the original author of the
    software where the software is used or presented in any form.
###########################################################################

Modification History

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  Mark Hadfield, 1997-05:
    Written.
  Mark Hadfield, 1999-12:
    Modified for IDL 5.3 constants.