DATE     93/09/28

    Opérateur -                                See also :+ 
    -----------                                          * 
                                                         / 
    RESU1 = OBJET1 - OBJET2 ;                            ** 

    Description :
    _____________

    The - operator does the substraction of the objects OBJET1 and
  OBJET2.

    Possible operations :
    ______________________    

----------------------------------------------------------------
|      OBJET1       |      OBJET2         |      RESULTAT      |
----------------------------------------------------------------
|      ENTIER       |      ENTIER         |       ENTIER       |
|      ENTIER       |     FLOTTANT        |      FLOTTANT      |
|     FLOTTANT      |      ENTIER         |      FLOTTANT      |
|     FLOTTANT      |     FLOTTANT        |      FLOTTANT      |
|     CHPOINT       |     CHPOINT         |      CHPOINT       |
|     CHPOINT       |     FLOTTANT        |      CHPOINT       |
|     EVOLUTION     |     EVOLUTION       |      EVOLUTION     |
|     LISTENTI      |     LISTENTI        |      LISTENTI      |
|     LISTREEL      |     LISTREEL        |      LISTREEL      |
|  TABLE 'VECTEUR'  |   TABLE 'VECTEUR'   |   TABLE 'VECTEUR'  |
----------------------------------------------------------------

    Remark 1 :
    _________

    When the - operator calculates the difference between a CHPOINT 
 and a FLOTTANT, it substracts the value of the FLOTTANT from all the
 values of the CHPOINT. The result of the difference between a FLOTTANT
 and a CHPOINT will be the same, except for the sign.


    Remark 2 :
    _________

    The - operator calculates the difference of two TABLE type objects
 of 'VECTEUR' subtype. The tables must be likely to be substracted, i.e.
 the elements with a common index must be of ENTIER or FLOTTANT type.


    Remark 3 :
    _________

    When the - operator calculates the difference between two EVOLUTION
 type objects, both the objects must have the same type, i.e. be real or
 complex :

    a) Real EVOLUTION objects :

    The sum is done for  OBJET1=f(x) defined on the D1 domain
                         OBJET2=g(x) defined on the D2 domain
 then the difference is calculated on the common domain (D1 and D2) .

    b) Complex EVOLUTION objects :

    Both objects must have the same abscissae. Each of the two objects
 can be either "PREE PIMA" or "MODU PHAS". The RESU1 object will have 
 the same type as OBJET1.

    Remark 4 :
    _________

    When the - operator calculates the difference between two lists
 of integers or real numbers, they must have the same number of
 elements.

    Remark 5 :
    _________

    When the - operator calculates the difference between two MCHAML
 for identical elementary subspaces, it does the difference for
 the identical names of components.