Use octave from C++ code

[b0b]

I am trying to use the Octave Control System Toolbox (OCST) from my own C++
code.

First, I searched for the control system functions (e.g. sysmult, tf, etc.)
if their equivalent functions in liboctave exists defined in the headers
(octave.h, etc.). But I couldnt find any except some Matrix functions.

Second, I wrote an Octave function ('pControlError') for doing my work and
tried to call it using 'feval'.

int main (const int argc, char ** argv)
{
  const char * argvv [] = {"main", "-q"};

  octave_main (2, (char **) argvv, true);

  octave_value_list plant_tf, sysArgs;
  Matrix plant_num(1,1), plant_den(1,2);

  plant_num (0,0)= 1;
  plant_den (0,0)= 1;
  plant_den (0,1)= 1;

  sysArgs (0) = 10;
  sysArgs (1) = plant_num;
  sysArgs (2) = plant_den;

  const octave_value_list result = feval ("pControlError", sysArgs, 1);

  std::cout << "result is " << result (0).scalar_value () << std::endl;

  do_octave_atexit ();
  return 0;
}

then compiled the code using:

>> mkoctfile --link-stand-alone main.cpp -o main

Now, while executing the code, i get the error that 'pControlError' is not
found:
error: feval: function `pControlError' not found

Whereas, I have copied the function pControlError into:
C:\Octave\3.2.4_gcc-4.4.0\share\octave\3.2.4\m

Also, if there were inbuilt function in liboctave for the OCST it would be
better as I need a fast code.--
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