Creating .oct files

[John W. Eaton]

On 19-Apr-2000, Peter Gawthrop <address@hidden> wrote:

| 1. It calls user defined .oct functions
| 2. It calsl the octave function  reshape

To call another function, whether it is defined in a .oct file or a .m
file, use feval().  For example:

  octave_value_list args;

  args(1) = p;
  args(0) = x;

  int nargout = 1;

  octave_value_list result = feval ("myfunc", args, nargout);

In Octave 2.1.x, feval is declared in parse.h and defined in parse.y.

| 3. It uses the octave "\" operator.

If you have two octave_value objects, you can use (with Octave 2.1.x):

  octave_value result = op_ldiv (x, y);

The op_ldiv function is declared (using a C preprocessor macro,
sorry!) in ov.h. 

If you already have two Matrix objects, you can use the solve member
function that is declared in Matrix.h:

  int info;
  double rcond;

  Matrix result = x.solve (y, info, rcond);

(The info and rcond arguments are optional).  This method eventually
calls an lapack subroutine.

jwe



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