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                    GODataMatrix;
                    GODataMatrixClass;
                    GODataMatrixSize;
GODataMatrixSize    go_data_matrix_get_size             (GODataMatrix *mat);
double *            go_data_matrix_get_values           (GODataMatrix *mat);
double              go_data_matrix_get_value            (GODataMatrix *mat,
                                                         unsigned  i,
                                                         unsigned  j);
char *              go_data_matrix_get_str              (GODataMatrix *mat,
                                                         unsigned  i,
                                                         unsigned  j);
void                go_data_matrix_get_minmax           (GODataMatrix *mat,
                                                         double *min,
                                                         double *max);
#define             GO_DATA_MATRIX_SIZE_CACHED
typedef struct {
	GODataClass base;
	void	 (*load_size)    (GODataMatrix *vec);
	void	 (*load_values) (GODataMatrix *vec);
	double	 (*get_value)   (GODataMatrix *mat, unsigned i, unsigned j);
	char	*(*get_str)	(GODataMatrix *mat, unsigned i, unsigned j);
} GODataMatrixClass;
typedef struct {
	int rows;	/* negative if dirty, includes missing values */
	int columns;	/* negative if dirty, includes missing values */
} GODataMatrixSize;
GODataMatrixSize go_data_matrix_get_size (GODataMatrix *mat);
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double * go_data_matrix_get_values (GODataMatrix *mat);
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double go_data_matrix_get_value (GODataMatrix *mat, unsigned i, unsigned j);
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char * go_data_matrix_get_str (GODataMatrix *mat, unsigned i, unsigned j);
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void go_data_matrix_get_minmax (GODataMatrix *mat, double *min, double *max);
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