void setMatDouble()
{
	MatrixLayer mat = Project.ActiveLayer();
	
	if(mat == NULL)
	{
		out_str("no valid matrix a active window");
		return;
	}
	if(mat.GetInternalData() == FSI_DOUBLE)
	{
		out_str("already double, no need to set again");
		return;
	}
	
	Matrix<WORD> bb(mat); // assume you know the matrix data type
	
	matrix temp; // both matrix and Matrix default is double
	
	temp = bb; // store the Origin matrix into our temp double matrix
	
	mat.SetInternalData(FSI_DOUBLE); // set matrix layer internal data type
	
	Matrix aa(mat); // attach a double matrix object to the new matrix
	
	aa = temp; // put original data back
}