[Scilab-users] Error - Optimization

[kgiovanna]

Hello,
 I tried to solve an LMI problem using lmitool but I received error which I
could not understand the source. The problem can find a answer but it is not
the best one. Did someone receive the same error?

For tests, I used: 
A = - 2.0499    0.8913    0.8214    0.9218  
    0.2311  - 2.2379    0.4447    0.7382  
    0.6068    0.4565  - 2.3846    0.1763  
    0.486     0.0185    0.7919  - 2.5943  
Q = eye(4,4)
My function object was trace.

The problem is:
lmisolver: Construção de representação canônica.
lmisolver: Construção básica.
lmisolver:     FASE DE VIABILIDADE.

    obj. primal  obj. dual fenda de dualidade 
     1.10e+00    -9.42e+02   9.43e+02
    -4.34e+00    -9.42e+02   9.37e+02
lmisolver: Valor alvo alcançado.
lmisolver: solução viável encontrada.
lmisolver:       FASE DE OTIMIZAÇÃO.

    obj. primal  obj. dual fenda de dualidade 
     3.04e+01    -1.74e+00   3.21e+01
xerbla: On entry to DGELS  parameter number  7 had an illegal value (lapack
library problem)
 !--error 998 
SCI\modules\core\macros\typeof.binat line     336 of function lmisolver
called by :  
at line      16 of function lyapunov called by :  
P = lyapunov(A,Q)
 
Erro em dgels, info = -7.
                  !--error 230 
semi def falhou.



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