Get pointer to data in Matrix classes [possible solution]

[José Luis García Pallero]

Hi,

From my last message:

Exist any method in Matrix and Column/RowVector classes to get a pointer for
access directly to the memory? I have some C functions that works with
matrices stored as vectors in column major order, and I would like to link

them with octave without duplicate memory copying the original data.

I wrote this example function for fill a matrix fron a C function:

#include<oct.h>
//assign data
void DataAssign(double* data,int nData);

//octave function
DEFUN_DLD(test,args,,"Assign test")
{
    //return list
    octave_value_list retval;
    //input arguments
    int rows=args(0).int_value();
    int cols=args(1).int_value();

    //creating the output matrix
    Matrix mat(rows,cols);
    //address of data
    double* data="">    //data assingn
    DataAssign(data,rows*cols);
    //assignment to return list

    retval(0) = mat;
    //returning results
    return retval;
}
void DataAssign(double* data,int nData)
{
    //assign
    for(int i=0;i<nData;i++)
        data[i] = i;
    //end of the function

    return;
}

This code appears to run OK in my tests. In liboctave.pdf says that Array<T> class has a method named data() that retirns a const pointer
to the memory space where the data are stored. I suppose that Matrix class inherit the method. Are the same for Row/ColumnVector classes?

Is correct the conversion double* data="" It runs but I don't know if exist any implication for future
operations with Matrix-Matrix operations.
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José Luis García Pallero
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