Double writing (Scilab gateway)

int write_double(char *fname,unsigned long fname_len)
{
	SciErr sciErr;
	int i,j;
	//first variable info : real matrix of double 3 x 4
	int iRows1			= 3;
	int iCols1			= 4;
	double* pdblReal1	= NULL;

	//second variable info : complex matrix of double 4 x 6
	int iRows2			= 4;
	int iCols2			= 6;
	double* pdblReal2	= NULL;
	double* pdblImg2	= NULL;

	/************************
	*    First variable    *
	************************/
	//alloc array of data in OS memory
	pdblReal1 = (double*)malloc(sizeof(double) * iRows1 * iCols1);

	//fill array with incremental values
	//[ 0   1   2   3
	//  4   5   6   7
	//  8   9   10  11]
	for(i = 0 ; i < iRows1 ; i++)
	{
		for(j = 0 ; j < iCols1 ; j++)
		{
			pdblReal1[i + iRows1 * j] = i * iCols1 + j;
		}
	}
	//can be written in a single loop
	//for(i = 0 ; i < iRows1 * iCols1; i++)
	//{
	//  pdblReal1[i] = i;
	//}

	//create a variable from a existing data array
	sciErr = createMatrixOfDouble(pvApiCtx, Rhs + 1, iRows1, iCols1, pdblReal1);
	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	//after creation, we can free memory.
	free(pdblReal1);

	/*************************
	*    Second variable    *
	*************************/
	//reserve space in scilab memory and fill it
	sciErr = allocComplexMatrixOfDouble(pvApiCtx, Rhs + 2, iRows2, iCols2, &pdblReal2, &pdblImg2);
	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	//fill array with incremental values for real part and decremental for imaginary part
	//[ 23i     1+22i       2+21i       3+20i       4+19i       5+18i
	//  6+17i   7+16i       8+15i       9+14i       10+13i      11+12i
	//  12+11i  13+10i      14+9i       15+8i       16+7i       17+6i
	//  18+5i   19+4i       20+3i       21+2i       22+1i       23  ]
	for(i = 0 ; i < iRows2 ; i++)
	{
		for(j = 0 ; j < iCols2 ; j++)
		{
			pdblReal2[i + iRows2 * j] = i * iCols2 + j;
			pdblImg2 [i + iRows2 * j]	= (iRows2 * iCols2 - 1) - (i * iCols2 + j);
		}
	}
	//can be written in a single loop
	//for(i = 0 ; i < iRows2 * iCols2; i++)
	//{
	//  pdblReal2[i] = i;
	//  pdblImg2 [i] = (iRows2 * iCols2 - 1) - i;
	//}

	// /!\ DO NOT FREE MEMORY, in this case, it's the Scilab memory

	//assign allocated variables to Lhs position
	LhsVar(1) = Rhs + 1;
	LhsVar(2) = Rhs + 2;
	return 0;
}

a_ref = [   0 1 2 3; ..
            4 5 6 7; ..
            8 9 10 11];
b_ref = [   23*%i,      1+22*%i,    2+21*%i,    3+20*%i,    4+19*%i,    5+18*%i; ..
            6+17*%i,    7+16*%i,    8+15*%i,    9+14*%i,     10+13*%i,  11+12*%i; ..
            12+11*%i,   13+10*%i,   14+9*%i,    15+8*%i,    16+7*%i,    17+6*%i; ..
            18+5*%i,    19+4*%i,    20+3*%i,    21+2*%i,    22+1*%i,    23];
[a,b] = write_double();
if or(a <> a_ref) then error("failed");end
if or(b <> b_ref) then error("failed");end