Re: Building Standalone Executables

[David Grundberg]

Tim Felty wrote:
> Everyone,
>  
> I am trying to build a standalone executable that makes use of 
> Octave's computational routines.
>  
> I have looked at the manual and have built the simple example and had 
> it work fine. However, I haven't been able to find any guide that 
> describes anything more complex than creating matrices within a 
> standalone app.
>  
> My code currently looks like this:
>  
> #include <iostream>
> #include <octave/oct.h>
>  
> using namespace std;
>  
> int
> main(void)
> {
>     cout << "Hello Octave world! This is a test\n";
>     int size;
>     cin >> size;
>  Matrix a_matrix = Matrix(1,size);
>  Matrix b_matrix = Matrix(1,size);
>  Matrix c_matrix = Matrix(1,size);
>  for (int column = 0; column < size; ++column)
>  {
>   a_matrix(column) = (column + 1);
>   b_matrix(column) = column*3 + 2;
>  }
>  c_matrix = a_matrix + b_matrix;
>  cout << a_matrix;
>  cout << b_matrix;
>  cout << c_matrix;
>  
>  // could not find infomration on how to use the Octave griddata function
>  // or any Octave function from within C++
>  double zi = griddata(a_matrix, b_matrix, c_matrix, 1, 3);
>  
>  cout<<zi<<endl;
>  
>     return 0;
> }
>  
> Any links to guides or just direct help would be appreciated.

Here is something in the right direction.

Compile with mkoctfile --link-stand-alone standalone.cc

David

#include <iostream>
#include <octave/oct.h>
#include <octave/octave.h>
#include <octave/parse.h> 
 
using namespace std;
 
int
main(void)
{
  char *argv[] = {"octave", NULL};
  octave_main (1, argv, true);
  cout << "Hello Octave world! This is a test\n";
  int size;
  cin >> size;
  Matrix a_matrix = Matrix (1,size);
  Matrix b_matrix = Matrix (1,size);
  Matrix c_matrix = Matrix (1,size);
  for (int column = 0; column < size; ++column)
    {
      a_matrix(column) = column + 1;
      b_matrix(column) = column * 3 + 2;
    }
  c_matrix = a_matrix + b_matrix;
  cout << a_matrix;
  cout << b_matrix;
  cout << c_matrix;

  octave_value_list args;
  args(0) = a_matrix;
  args(1) = b_matrix;
  args(2) = c_matrix;
  args(3) = 1;
  args(4) = 3;
 
  octave_value_list result = feval ("griddata", args);
  if (! error_state && result.length () > 0)
    {
      double zi = result(0).double_value ();
      cout << zi << endl;
    }
  else
    {
      error ("while executing griddata");
      return 1;
    }
 
  return 0;
}