[Coin-ipopt] question:meaning of outputs, C_WATCH (wacthdog characters)

[Andreas Waechter]

Hi Saeed,

In "Section" 4 in the COIN/Ipopt/doc/README.IPOPT file you can find a brief
description of the character following the ALFA(X) number:

ALFA(X)  Step size for primal variables after line search.
            If followed by 'h' or 'H', the filter has been augmented in
            this iteration, and if 'f' or 'F', the filter has not been
            augmented.  Here, the capital letter is used if a step with
            a second-order correction has been accepted.
            If followed by 'K', a step in the 'KKT-reduction restoration
            phase' has been taken.  A '-' (dash) indicates that the
            iteration has been aborted and the regular restoration phase
            has been activated.

I hope this helps,

Andreas



                                                                                                                                                    
                      saeed serpooshan                                                                                                              
                      <sserpooshan at yahoo.com>         To:       coin-ipopt at list.coin-or.org                                                         
                      Sent by:                        cc:                                                                                           
                      coin-ipopt-bounces at list.        Subject:  [Coin-ipopt] question:meaning of outputs,       C_WATCH  (wacthdog characters)      
                      coin-or.org                                                                                                                   
                                                                                                                                                    
                                                                                                                                                    
                      12/22/2004 05:08 AM                                                                                                           
                                                                                                                                                    
                                                                                                                                                    




hello
i have a question about IPOPT output ALFA(X),
as you see here:

ITER     ERR       MU      ||C||    ||D||   ALFA(X) #LS  ...
    0 .100D+01d .100D+00 .141D+01 .000D+00 .000D+00   0
    1 .201D+01d .100D+00 .671D-15 .169D+02 .100D+01H  1
    2 .920D-02d .100D+00 .312D-05 .347D-01 .100D+01f  1
    3 .399D-02p .200D-01 .537D-02 .133D+01 .100D+01f  1
    4 .951D-03d .283D-02 .149D-04 .815D-01 .100D+01h  1
    5 .149D-03d .150D-03 .257D-05 .262D-01 .100D+01h  1
   ........

each value of ALFA(X) is followed by
a char 'H' or 'f' or 'h' such as
.100D+01H  or .100D+01f  or  .100D+01h
i read IPOPT.ReadMe file but i can't find what this means!
i see in it must be C_WATCH variable that is
some info about watchdog but i can't find more info
about meaning of each character.
can you help me?

thanks alot
saeed serpooshan


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