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void matrix_set(double *M, long cols, long i, long j, double val);
void matrix_add(double *M, long cols, long i, long j, double val);
void matrix_mul(double *M, long cols, long i, long j, double val);
double matrix_get(double *M, long cols, long i, long j);
void matrix3_set(double *M, long N2, long N3, long i, long j, long k,
double val);
double matrix3_get(double *M, long N2, long N3, long i, long j, long k);
void print_matrix(double *M, long rows, long cols);
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