[Csdp] SDP is dual infeasible

[Hui Wu]

I am not too sure ...
If it is unbounded, then it needs more constraints, right ?

Appreciate your analysis !

Hui


On Thu, Nov 14, 2013 at 4:56 PM, Wendel Melo <wendelalexandre at gmail.com>wrote:

> Maybe your problem is unbounded and so, CSDP is declaring infeasibility.
> (We can say primal objective function getting huge vaules before CSDP stop).
>
> Can you be sure your problem is not unbounded?
>
>
> 2013/11/14 Hui Wu <wuhuing at gmail.com>
>
>>  resend after joining the mail list :)
>> On Nov 13, 2013 9:51 PM, "Hui Wu" <wuhuing at gmail.com> wrote:
>>
>>> Hi Guys, I am using csdp's matlab interface for the following sdp
>>> problem, which is described in the attachment. While I run the script, I get
>>>
>>> *>>[x, y, z] = genSample();*
>>> *Number of constraints: 6 *
>>> *Number of SDP blocks: 1 *
>>> *Number of LP vars: 0 *
>>> *C block 1, blocksize, 6*
>>> *Checking constraint 1 *
>>> *Checking constraint 2 *
>>> *Checking constraint 3 *
>>> *Checking constraint 4 *
>>> *Checking constraint 5 *
>>> *Checking constraint 6 *
>>> *Iter:  0 Ap: 0.00e+00 Pobj:  0.0000000e+00 Ad: 0.00e+00 Dobj:
>>>  0.0000000e+00 *
>>> *Iter:  1 Ap: 1.00e+00 Pobj:  2.4901133e+04 Ad: 6.77e-01 Dobj:
>>>  3.0972415e+03 *
>>> *Iter:  2 Ap: 1.00e+00 Pobj:  1.7734229e+05 Ad: 5.18e-01 Dobj:
>>>  1.6715331e+02 *
>>> *Iter:  3 Ap: 2.10e-02 Pobj:  9.3394935e+05 Ad: 2.66e-02 Dobj:
>>>  1.2916856e+03 *
>>> *Iter:  4 Ap: 1.00e+00 Pobj:  5.7585163e+07 Ad: 1.05e-01 Dobj:
>>>  1.0092369e+03 *
>>> *Iter:  5 Ap: 2.82e-03 Pobj:  5.3050644e+08 Ad: 2.97e-03 Dobj:
>>>  8.2813968e+02 *
>>> *Iter:  6 Ap: 1.29e-03 Pobj:  2.8396651e+09 Ad: 2.90e-03 Dobj:
>>>  9.6682104e+02 *
>>> *Declaring dual infeasibility.*
>>> *Success: SDP is dual infeasible*
>>> *Certificate of dual infeasibility: tr(CX)=1.00000e+00,
>>> ||A(X)||=4.91757e-09*
>>> *Elements time: 0.000010 *
>>> *Factor time: 0.000045 *
>>> *Other time: 0.000882 *
>>> *Total time: 0.000937 *
>>>
>>> Can some body help tell me why my SDP is dual infeasible ? Is it because
>>> there is something wrong with my problem setting or it is normal to my SDP?
>>> Thanks
>>>
>>> Hui
>>>
>>>
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>
>
> --
> Wendel
>
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