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struct_filter

 SYNOPSIS
  Apply a filter to a struct

 USAGE
  struct_filter(Struct_Type s, Int_Type i)

 DESCRIPTION
  This function applies the filter `i' to the fields of a structure
  by performing the operation

    s.field = s.field[i];

  on each array field of the structure.  Scalar fields will not be modified.

  The `dim' qualifier may be used to filter on a specific array
  dimension.  For example, consider the structure

    s = struct { a = Int_Type[10], b = Int_Type[10,20] };

  Then

    struct_filter (s, i; dim=0);

  would produce the same result as

    s.a = s.a[i];
    s.b = s.b[i,*];


 NOTES
  By default this function modifies the fields of the structure passed
  to it.  Sometimes it is desirable to create a new structure and
  leave the old one untouched.  This may be achieved using the
  `copy' qualifier, e.g.,

     filtered_s = struct_filter (s, i; copy);


 SEE ALSO
  where

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

struct_combine

 SYNOPSIS
  Combine two or more structures

 USAGE
  new_s = struct_combine (s1, s2, ...)

 DESCRIPTION
  This function creates a new structure from two or more structures
  `s1', `s2',....  The new structure will have fields formed by the
  union of the fields of the input structures.  The new structure fields will
  be given values that correspond to the fields of the input structures.  If
  more than one structure has the same field name, the value of the field will
  be given by the last structure.

  If any of the input values is a string, or an array of strings, then
  it will be interpreted as a representing a structure with the
  corresponding field names.  This is a useful feature when one wants
  to expand a structure with new field names, e.g.,

    s = struct { foo, bar };
    t = struct_combine (s, "baz");   % t = struct {foo, bar, baz};


 NOTES
  The same effect can be achieved by using the dereference operator, e.g.,

    t = struct { @s, "baz" };


 SEE ALSO
  get_struct_field_names

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

struct_field_exists

 SYNOPSIS
  Determine whether or not a structure contains a specified field

 USAGE
  Int_Type struct_field_exists (Struct_Type s, String_Type f)

 DESCRIPTION
 This function may be used to determine if a structure contains a field with
 a specfied name.  It returns 0 if the structure does not contain the field,
 or non-zero if it does.

 SEE ALSO
  get_struct_field_names

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