Re: Problem creating compiled oct file

[babelproofreader]

I have written a function that by necessity uses a loop for recursive
calculations and also has loops within the main loop and as a result it is
very slow. Despite much investigation I have not been able to find out how
to vectorise this function and so have decided to compile an oct file as I
believe the loop structures can be easily written in c++. However I am
having problems just passing arguments to the function and retrieving the
output value. My code so far, in a file called "loop.cc", is....

My immediate problem is now solved and I post the code below in the hope
that it will help others who may search this forum.

#include <octave/oct.h>
#include <octave/dColVector.h>
     
DEFUN_DLD (basicloop, args, , "Help String")
{
octave_value retval;

 ColumnVector c = args(0).column_vector_value ();       // This is the input
argument, in column vector form
 ColumnVector d(c);                                                      //
This will be the output column vector returned to Octave by "retval"
 int ii;                                                                        
  
// Declare the loop counter ii as integer type

 for (ii = octave_idx_type (0); ii<c.length (); ii++)       // Start the
loop
     {
     d(c.length () - ii - 1) = c(ii) + 0.5;                          // Do
something in the loop calculation
     }
 
 retval = d;                                                            //
Assign the output column vector to the return value

return retval;                                                        //
Return the output to Octave
}


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