Trouble building mex function from .c file

I have some old c code that someone made a while ago that I'm trying to use in a MATLAB project so I'm trying to convert the c functions to mex functions. I'm new to both c and mex functions, but I've managed to get the compiler installed (Xcode 7 on Mac OSX) and I've written what I thought would let me build the mex function, but I keep getting the following error:

Error using mex
/C_GAmodel/GAmodel.c:108:22: error: passing 'double *' to
parameter of incompatible type 'double'; dereference with *
  AircraftModel_(j,Swing, Wspan, FLength, FDiameter, Vel, GTOW, LoverD, BendStress,
  Range, Vstall, Climbrate);
                   ^~~~~
                   *
/C_GAmodel/decfunc.h:3:35: note: passing argument to parameter
here
void AircraftModel_(double, double, double,double, double, double, double *,double *,
double *, double *, double *, double*);
                                ^
1 error generated.

You can see in this error a line of code declaring the function AircraftModel_. The code I've written to try to generate the mex function is:

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])

{
    /* Inputs */
    double *Swing;
    double *Wspan;
    double *FLength;
    double *FDiameter;
    double *Vel;
    /* Outputs */
    double *GTOW;
    double *LoverD;
    double *BendStress;
    double *Range;
    double *Vstall;
    double *Climbrate;
    int j;

    /*
    Swing=  14.3;  // Wing area
    Wspan=10.5;    // Wing Span
    FLength=8.22;  // Fuselage Length
    FDiameter=1.5;  // Fuselahge Diameter
    Vel=40.36;    // Cruise Velocity
     */

    j=0 ;      // Calculates everything

    /* Check for proper number of arguments. */
    if(nrhs!=5) {
        mexErrMsgIdAndTxt( "MATLAB:GAmodel:invalidNumInputs",
                          "Five inputs required.");
    } else if(nlhs!=6) {
        mexErrMsgIdAndTxt( "MATLAB:GAmodel:maxlhs",
                          "Six output arguments required.");
    }

    /* Create matrices for the return arguments. */
    plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
    plhs[1] = mxCreateDoubleMatrix(1, 1, mxREAL);
    plhs[2] = mxCreateDoubleMatrix(1, 1, mxREAL);
    plhs[3] = mxCreateDoubleMatrix(1, 1, mxREAL);
    plhs[4] = mxCreateDoubleMatrix(1, 1, mxREAL);
    plhs[5] = mxCreateDoubleMatrix(1, 1, mxREAL);

    /* Assign pointers to each input and output. */
    Swing = mxGetPr(prhs[0]);
    Wspan = mxGetPr(prhs[1]);
    FLength = mxGetPr(prhs[2]);
    FDiameter = mxGetPr(prhs[3]);
    Vel = mxGetPr(prhs[4]);
    GTOW = mxGetPr(plhs[0]);
    LoverD = mxGetPr(plhs[1]);
    BendStress = mxGetPr(plhs[2]);
    Range = mxGetPr(plhs[3]);
    Vstall = mxGetPr(plhs[4]);
    Climbrate = mxGetPr(plhs[5]);

    /*  call the C subroutine */
    AircraftModel_(j,Swing, Wspan, FLength, FDiameter, Vel, GTOW, LoverD, BendStress, Range, Vstall, Climbrate);

}

And the subroutine I'm trying to call is declared as:

void AircraftModel_(

                    // Function to be evaluated
                    double j,
                    // design variables
                    double Swing,
                    double Wspan,
                    double FLength,
                    double FDiameter,
                    double Vel,
                    // system metrics
                    double *GTOW,
                    double *LoverD,
                    double *BendStress,
                    double *Range,
                    double *Vstall,
                    double *Climbrate
                    )

{<function body>}

Any help would be appreciated, thanks in advance!

Answer 1

[James Tursa]

Your prototype declares the first six arguments as double, not pointer_to_double:

void AircraftModel_(double, double, double,double, double, double, double *,double *,
double *, double *, double *, double*);

So you need to pass in doubles for these, not pointers. E.g. change your call to this (to dereference your input pointer_to_double variables to double variables):

   AircraftModel_(j, *Swing, *Wspan, *FLength, *FDiameter, *Vel, GTOW, LoverD, BendStress, Range, Vstall, Climbrate);

[Callen Brooks]

Thanks, this fixed it! Sorry for the rookie mistakes in C, haha, but now that the mex function wrote properly I can go back to working in MATLAB for the time being.