Thread: Help needed

I'm using a C function in matlab simulink to get the output of non linear equation of the form y = x + e^x. Though I can't get through this after a big headache and a lot of effort. You are my last hope my friends, so thank you in advance.

Here is the code:

Code:

void Sigma(const real_T *Tc,const real_T *Irradiance,const real_T *Vpv,const real_T *Ipv, real_T *I0)
{
    real_T Irs, Is, J, Tcc;
    (Ipv[0] < 0) ? (J=0) : (J = Ipv[0]);
    Tcc = (Tc[0]) + 273.15; /* Celsius to Kelvin Trasformation*/
    Irs = (IscRef) / (exp((q) * ((VocRef) + (beta) *((Tcc)-(Tref))) / ((Ns) * (K) * (eta) * (Tcc))) -1);
    Is = (Irs) * (pow(Tcc/Tref, 3)) * exp( (q) * (Eg) * (1/(Tref) - 1/(Tcc))/((K) * (eta)));
    I0[0] = (Np) * (((alpha) * ((Tcc) - (Tref)) + (IscRef)) * (Irradiance[0])/(Irradiance_ref)) -
            ((Is) * (exp((q) * ((Vpv[0])/(Ns) + (J) * (Rs)/(Np)) / ((K) * (Tcc) * (eta))) -1) +
            ((Np)/(Ns) * (Vpv[0]) + (J) * (Rs)) / (Rsh));
}

All the parameters are defined externally as double.
Matlab has a C compiler installed and co-working with it in real time

Here is the builder error:

Code:

Error PV_module_wrapper.c: 71  syntax error; found `{' expecting `;' 
Error PV_module_wrapper.c: 71  skipping `{' 
Error PV_module_wrapper.c: 75  operands of - have illegal types `double' and `pointer to const double' 
Error PV_module_wrapper.c: 75  operands of * have illegal types `pointer to const double' and `int' 
Error PV_module_wrapper.c: 75  operands of * have illegal types `pointer to const double' and `pointer to const double' 
Error PV_module_wrapper.c: 75  operands of * have illegal types `pointer to const double' and `pointer to const double' 
Error PV_module_wrapper.c: 75  operands of * have illegal types `int' and `pointer to const double' 
Error PV_module_wrapper.c: 75  operands of / have illegal types `pointer to const double' and `double' 
Error PV_module_wrapper.c: 76  operands of / have illegal types `double' and `pointer to const double' 
Error PV_module_wrapper.c: 76  operands of * have illegal types `pointer to const double' and `pointer to const double' 
Error PV_module_wrapper.c: 76  operands of / have illegal types `int' and `pointer to const double' 
Error PV_module_wrapper.c: 76  operands of * have illegal types `pointer to const double' and `pointer to const double' 
Error PV_module_wrapper.c: 77  undeclared identifier `I0' 
Error PV_module_wrapper.c: 77  type error: pointer expected 
Error PV_module_wrapper.c: 77  operands of - have illegal types `double' and `pointer to const double' 
Error PV_module_wrapper.c: 77  operands of * have illegal types `pointer to const double' and `int' 
Error PV_module_wrapper.c: 77  operands of * have illegal types `pointer to const double' and `double' 
Error PV_module_wrapper.c: 77  operands of / have illegal types `int' and `pointer to const double' 
Error PV_module_wrapper.c: 77  operands of * have illegal types `pointer to const double' and `int' 
Error PV_module_wrapper.c: 78  operands of / have illegal types `double' and `pointer to const double' 
Error PV_module_wrapper.c: 78  too many errors 
 
  C:\PROGRA~1\MATLAB\R2009B\BIN\MEX.PL: Error: Compile of 'PV_module_wrapper.c' failed.

What are the following declared as?


IscRef
q
VocRef
beta
Tref
Ns
K
eta
Eg
Np
alpha
Irradiance_ref
Rs
Rsh

My bet is that one or more of them are pointers

Are these variables from your MATLAB program?

The canonical rule when dealing with any compiler is to fix the first error first and then recompile. This means you should look only at this line and ignore everything else until its fixed:

Code:

Error PV_module_wrapper.c: 71  syntax error; found `{' expecting `;'

Do you have a *.mat file?

See this link
https://maxwell.ict.griffith.edu.au/...ile_format.pdf
Look at the C example

Originally Posted by Prefas

Is there a ';' needed in first line?
"void Sigma(...);" ?

It's probably something from before the subroutine.

Originally Posted by Click_here

It's probably something from before the subroutine.

the part before this subroutine is automatically generated by matlab including initializing, calling methods and terminate.
I only have to write the mdlOutput subroutine which is pasted above

The above code seems fine to you?

Something is not right...

Have a look through here - Make sure you are doing everything right
C Shared Libraries - MATLAB & Simulink - MathWorks Australia

Try dereferencing the all the imported values
"`double' and `pointer to const double'"

They appear to be pointers.

Do not put ';' in the first line.