Help with linprog error message

I am trying to use linprog to solve for my min but I am getting the error message below

% Code Define System 

% Simple MSD

M=75; b=100; k=10000; deltar=0.2; MM=500; bb=10000; kk=50000; deltarr=.28; MMM=10; kkk=500000; 

deltarrr=.03; 

g=9.8; 

qmax=[.03333; .2; .15; .0002; .3; 0];

qmin=[-.03333; .1;-.15; -.0002; .05; -4.5];

tauc=0.5;

Sw=2*tauc*(2*(75+500+10)*9.8)^2;

AA= [ 0 0 0 1 0 0 0;
      0 0 0 0 1 0 0;
      0 0 0 0 0 1 0;
    -k/M k/M 0 -b/M b/M 0 0;
     k/MM  ((-k/MM)+(-kk/MM))   kk/MM  b/MM ((-b/MM)-(bb/MM))  bb/MM 0;
       0 kk/MMM ((-kk/MMM)+(-kkk/MMM)) 0 bb/MMM -bb/MMM 1/MMM;
    0 0 0 0 0 0 -1/tauc];

BB = [0; 0; 0; 0; 1/MM; -1/MMM; 0];

GG= [0; 0; 0; 0; 0; 0;1/tauc];

DDx=[-k/M k/M 0 -b/M b/M 0 0;
    0 1 0 0 0 0 0;
    0 0 0 0 1 0 0;
    k/MM  ((-k/MM)+(-kk/MM))   kk/MM  b/MM ((-b/MM)-(bb/MM))  bb/MM 0;
    0 1 -1 0 0 0 0;
    0 0 0 0 0 0 0];

DDu=[0; 0; 0; 1/MM; 0; 1];

DDw=[0; 0; 0; 0; 0; 0];

nx=7; nu=1; nw=1; nz=6;

p_ossop= -5733;

g_q=zeros(nx+nu+nz,1); g_q(2)=.1;

A=[];b=[];

Aeq=[zeros(nx,nz) AA BB;-eye(nz,nz) DDx DDu];

beq=[-GG*p_ossop;-DDw*p_ossop];

UB=[qmax; inf*ones(nx+nu,1)];

LB=[qmin; -inf*ones(nx+nu,1)];

[ossop,fval,exitflag] = linprog(g_q,A,b,Aeq,beq,LB,UB);

if exitflag == 1

     q_ossop=ossop(1:nz)

s_ossop=ossop(nz+1:nz+nx)

     m_ossop=ossop(nz+nx+1:nz+nx+nu)

else

error

I keep getting the error:

Exiting: One or more of the residuals, duality gap, or total relative error has stalled: the primal appears to be infeasible (and the dual unbounded). (The dual residual < TolFun=1.00e-08.) Error using error Not enough input arguments.

Error in ProjectMSDexample_ContTime (line 44) error

Any help would be greatly appreciated.

Thanks in Advance

Answer 1

[Matt J]

It means there appear to be no feasible solutions. Your constraints define an empty set.