Mask (3sciport)

Returns a bit mask

SYNOPSIS

  boolean = MASK( arg )

FUNCTION VALUE

  mask            Boolean. (Integer.)
                  A mask of one bits.

ARGUMENTS

  arg             Integer.
                  An integer input argument.

DESCRIPTION

  The external function MASK returns a bit mask of 1's whose length is
  determined by arg, where arg is some integer in the closed interval
  [0,128]. When arg is in the closed interval [0,63], a left justified mask
  of length arg is returned. When arg is in the closed interval [64,128], a
  right justified mask of length 128-arg is returned.

  For equations and other information, see Volume 3: UNICOS Math and
  Scientific Library Reference Manual SR-2081 7.0, Cray Research, Inc.