Thread: Help needed

Originally Posted by c99tutorial

Another suggestion> Why don't you start with the simplest possible function before adding something complicated. Since you seem to be using a custom build environment like Matlab. You should first make a "Hello Matlab" function to get a hold of the basics of what this environment expects.

It doesn't change anything if you change the math function. If you solve one error you solve every error of this kind. And if I use a simple function I can't find out what is needed for my problem..
For example if I had 1 parameter I would have the same error as with 10 parameters. But with 10 parameters you will need 10 corrections which are the same

yes, c compiler is LCC
thank you for your help..!

A lot of the errors are fixed..
This is the current status

Code:

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

Builder Info:

Code:

Error PV_module_wrapper.c: 71  syntax error; found `{' expecting `;' 
Error PV_module_wrapper.c: 71  skipping `{' 
Error PV_module_wrapper.c: 82  unrecognized declaration 
3 errors, 0 warnings 
 
  C:\PROGRA~1\MATLAB\R2009B\BIN\MEX.PL: Error: Compile of 'PV_module_wrapper.c' failed.

Any ideas?

Originally Posted by Prefas

It is a C function builder and you provide the c code for the output (the above code) separately from the parameters

Originally Posted by Prefas

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

Originally Posted by Prefas

I use this type of block
S-Function Builder Dialog Box - MATLAB & Simulink

And the code goes at the "outputs pane" section

Code:

void Sigma(const real_T *Tc,const real_T *Irradiance,const real_T *Vpv,const real_T *I, real_T *Ipv)
{

Code:

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

Are you sure that you have to write the function header? After reading through the link you've posted I think you only have to write the function body. So try to get rid of the first line and the curly braces.

Bye, Andreas

Andreas, thank you. It finally compiled without errors with your advice and some other changes.
But I'm disappointed because this doesn't seem to bypass the algebraic loop I was trying to avoid with this function..
Anyway thank you all for your help!
Peace and laugh