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# scipy.linalg.solve_triangular

`scipy.linalg.``solve_triangular`(a, b, trans=0, lower=False, unit_diagonal=False, overwrite_b=False, debug=False, check_finite=True)

  Solve the equation a x = b for x, assuming a is a triangular matrix.

  > Parameters: | a : (M, M) array_like A triangular matrix b : (M,) or (M, N) array_like Right-hand side matrix in a x = b lower : bool, optional Use only data contained in the lower triangle of a. Default is to use upper triangle. trans : {0, 1, 2, ‘N’, ‘T’, ‘C’}, optional Type of system to solve:
  > trans | system
  > --- | ---
  > 0 or ‘N’ | a x = b
  > 1 or ‘T’ | a^T x = b
  > 2 or ‘C’ | a^H x = b
  unit_diagonal : bool, optional If True, diagonal elements of a are assumed to be 1 and will not be referenced. overwrite_b : bool, optional Allow overwriting data in b (may enhance performance) check_finite : bool, optional Whether to check that the input matrices contain only finite numbers. Disabling may give a performance gain, but may result in problems (crashes, non-termination) if the inputs do contain infinities or NaNs.
  Returns: | x : (M,) or (M, N) ndarray Solution to the system a x = b. Shape of return matches b.
  Raises: | LinAlgError If a is singular

  Notes

  New in version 0.9.0.