Re: Urgent help with qp

[Mathieu Dubois]

Hello,

I dont know the qp function but I think that

[X, OBJ, INFO, LAMBDA] = qp([],H,c,A,b,lb,ub,options);

should work (it works on my computer).

AFAIU, if you pass bounds (A, B, LB, UB, A_LB, A_UB), octave will also 
need the A_in matrix and check for it's size (line 252).
This which is wrong in your call because A_in is empty.

Note that the help don't mention if bounds are empty that A_in matrix 
must nevertheless have the correct size.
Maybe that should be changed.

Just for the record, INFO contains:

octave:22> INFO

INFO =
  scalar structure containing the fields:
    solveiter =  3

    info = 0

If I understand correctly this means that the solution is found in 3 
iterations.

HTH,
Mathieu

Le 23/02/2013 16:41, Myriam Abramson a écrit :
> Hello,
>
> I am trying to use qp and I need to specify the maximum number of
> iterations but I don't know how to do that. I did the following with
> no success. I have Octave 3.4.3 on Ubuntu 12.04. Please help!
>
> H=[1.0 0.5 0 0;0.5 1 0 0;0 0 0 0; 0 0 0 0];
> A=[1 2 1 0;1 1 0 1];
> lb=[0 0 0 0];
> ub=[1.0e+22 1.0e+22 1.0e+22 1.0e+22 ];
> b=[7;5];
> c=[10;11;0;0];
> options=optimset('MaxIter',1000);
>
> octave> qp([],H,c,A,b,lb,ub,[],[],[],options);
> error: qp: inequality constraint matrix has incorrect column dimension
> error: called from:
> error:   /usr/local/share/octave/3.4.3/m/optimization/qp.m at line 252, column 9