Manual pages | Cast3M

$$$$ MOCA     NOTICE  CHAT      11/09/12    21:17:16     7124           
                                             DATE     11/09/12
                                       
 
    Operateur MOCA                            Voir aussi : AJUSTE EXCE
    --------------                                         LEVM   
    RESU1 = MOCA LISTPARA LISTMESU LISTFONC LISTDERi (('POIDS' LISTPOI);
                                



    Description :
    ____________


    Consider a function G known at n points. We are looking for 
parameters(a,b,c,...,p) of a fonction F in order to best fit the 
function G.
    The MOCA operator help in founding such a set of parameters. 
LISTMESU(listreel) gives the known values of G.

    In addition a set of parameter (LISTPARA) must be given as well as 
the values of F (LISTFONC -n values-) for this set of parameters. 
     
     At last the LISTDERi (listreels of n values)(i=1,p)  which contains
the partials derivatives of F in front of parameters.
    
    This operator suppose that F is linear in function of parameters and
outputs the set of parameters that minimize the criteria :
Sum over j=1,n(poidj*poidj*(listmesu(j)-listF(j))*(listmesu(j)-listF(j)) 




      Contents :
      _________

      LISTPARA  : LISTREEL of P values representing initial values of 
                  parameters

      LISTMESU  : LISTREEL of n values which gives the known values of G

      LISTFONC  : Values of F for the set of parameters and at the n 
                  points (LISTREEL of n values).  
 
      LISTDERi  : p LISTREEL, each one gives the partial derivative of F
                ( for the n points) in front of the ith parameter.


      POIDS     : this key word introduce the data  LISTPOI which gives 
                  weight to be given at each point to compute the 
                  criteria. If missing all points are equal.
                  

      RESU1     : values of new set of parameters LISTREEL.


     Remarks  : The data file identifi.dgibi gives an ex ample of use of 
                this operator for a non linear function F. Then an 
                iterative scheme is needed.