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$$$$ DIAD     NOTICE  CHAT      11/09/12    21:15:53     7124           
                                             DATE     11/09/12

    Operateur DIAD                           Voir aussi : MULTIDEC
    --------------                                        MULTIREC   
    LIST1  = DIAD (MOT1) LIST2  ;
                                     MOT1='DIRE','INVE','IVIN'


    Description :
    -------------

    If MOT1='DIRE'(ct), the DIAD operator constructs LIST1,
    suppressing one value of LIST2 out of two (LISTREEL type).
    The first point is always maintained.

    If MOT1='INVE'(rse), the DIAD operator constructs LIST1 by
    inserting a zero between each point of LIST2, after the first 
    point and length(LIST1)=2*length(LIST2) if length (LIST2)
    is even, or 2*length(LIST2)-1 if length(LIST2) is odd.

    If MOT1='IVIN', the DIAD operator constructs LIST1 by inserting 
    the mean of the two bordering points according to the same 
    length rules as above.

     
    options :
    ---------

    MOT1 equals 'DIRE', 'INVE' or 'IVIN'. The default is 'DIRE'.