Error:The constraints must return a real, dense, double precision vector.

[Jingqian Chen]

Hi,

I run the large scale nonlinear problem with ipopt solver, but it didn't work, and  returns

>> optiprv1

OPTI Derivative Checker detected no problems in 'Objective Gradient'

OPTI Derivative Checker detected no problems in 'Constraint Jacobian'

OPTI Derivative Checker detected no problems in 'Hessian of the Lagrangian'

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Nonlinear Program (NLP) Optimization

 min  f(x)

 s.t. rl <= Ax <= ru

      lb <= x <= ub

      cl <= c(x) <= cu

------------------------------------------------------

   Problem Properties: 

# Decision Variables:       23

# Constraints:              70

  # Linear Equality:         8

  # Bounds:                 46

  # Nonlinear Inequality:   16

------------------------------------------------------

  Solver Parameters:

Solver:                    IPOPT

Objective Gradient:        gradient

Constraint Jacobian:       @(x) ...

Jacobian Structure:        Supplied

Lagrangian Hessian:        @(x) ...

Hessian Structure:         Supplied

------------------------------------------------------

This is Ipopt version 3.12.9, running with linear solver ma57.

Number of nonzeros in equality constraint Jacobian...:       24

Number of nonzeros in inequality constraint Jacobian.:       56

Number of nonzeros in Lagrangian Hessian.............:       31

Total number of variables............................:       23

                     variables with only lower bounds:        0

                variables with lower and upper bounds:       23

                     variables with only upper bounds:        0

Total number of equality constraints.................:        8

Total number of inequality constraints...............:       16

        inequality constraints with only lower bounds:       16

   inequality constraints with lower and upper bounds:        0

        inequality constraints with only upper bounds:        0

iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr  ls

   0  2.7851032e-01 1.18e+02 1.00e+00  -1.0 0.00e+00    -  0.00e+00 0.00e+00   0

Reallocating memory for MA57: lfact (746)

*** Error using Ipopt Matlab interface: ***

The constraints must return a real, dense, double precision vector.

Exception of type: IpoptException in file "Unknown File" at line -1:

 Exception message: Unknown Exception caught in Ipopt

Exception of type: IpoptException in file "Unknown File" at line -1:

 Exception message: Unknown Exception caught in Ipopt

How can I solve it?

Thanks.