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Code Editor : setfuns.hlp

complement

SYNOPSIS
  Extract the elements of a set that are not contained in other sets.

USAGE
  indices = complement (a, b, ..., c)

DESCRIPTION
  This function computes the elements of the first argument (`a')
  that are not contained in the sets given by the other arguments
  (`b,...,c') and returns them in the form of indices into the
  first argument.

EXAMPLE

a = {"foo", PI, 7};
   b = [1,2,3,PI];
   indices = complement (a, b);

Upon return, `indices' will have the value `[0, 2]' since
  `a[0]' and `a[2]' are not contained in `b'.

NOTES
  A set may either be an Array_Type or a List_Type object.
  For a homogeneous collection of objects, it is better to
  use an Array_Type. i.e., `[1,2,3]' instead of `{1,2,3}'.

SEE ALSO
  intersection, ismember, union, unique

--------------------------------------------------------------

intersection

SYNOPSIS
  Extract the common elements of two or more sets

USAGE
  indices = complement (a, b, ..., c)

DESCRIPTION
  This function computes the common elements of two or more sets and
  returns them in the form of indices into the first argument.

EXAMPLE

a = {"foo", 7, PI};
   b = {PI, "bar", "foo"};
   indices = intersection (a, b);

Upon return, `indices' will have the value `[0, 2]' since
  `a[0]' and `a[2]' are the common elements of the sets.

NOTES
  A set may either be an Array_Type or a List_Type object.
  For a homogeneous collection of objects, it is better to
  use an Array_Type. i.e., `[1,2,3]' instead of `{1,2,3}'.

SEE ALSO
  complement, ismember, union, unique

--------------------------------------------------------------

ismember

SYNOPSIS
  test to see if the elements of one set are members of another

USAGE
  val = ismember (a, b)

DESCRIPTION
  This function may be used to see which of the elements of the set
  `a' are members of the set `b'.  It returns a boolean
  array indicating whether or not the corresponding element of
  `a' is a member of `b'.

NOTES
  A set may either be an Array_Type or a List_Type object.
  For a homogeneous collection of objects, it is better to
  use an Array_Type. i.e., `[1,2,3]' instead of `{1,2,3}'.

SEE ALSO
  complement, intersection, union, unique

--------------------------------------------------------------

union

SYNOPSIS
  Form a set of the unique elements of one ore more subsets

USAGE
  abc = union (a, b,..., c)

DESCRIPTION
  This function interprets each of its arguments as a set, then merges
  them together and returns only the unique elements.  The returned
  value may either be an Array_Type or a List_Type
  object.

NOTES
  A set may either be an Array_Type or a List_Type object.
  For a homogeneous collection of objects, it is better to
  use an Array_Type. i.e., `[1,2,3]' instead of `{1,2,3}'.

SEE ALSO
  complement, intersection, ismember, unique

--------------------------------------------------------------

unique

SYNOPSIS
  Get the indices of the unique elements of a set

USAGE
  indices = unique (A)

DESCRIPTION
  This function returns an array of the indices of the unique elements
  of a set.

NOTES
  A set may either be an Array_Type or a List_Type object.
  For a homogeneous collection of objects, it is better to
  use an Array_Type. i.e., `[1,2,3]' instead of `{1,2,3}'.

SEE ALSO
  complement, intersection, ismember, union

--------------------------------------------------------------

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Code Editor : setfuns.hlp