spsolve_triangular(A, b, lower=True, overwrite_A=False, overwrite_b=False)¶
Solve the equation A x = b for x, assuming A is a triangular matrix.
A : (M, M) sparse matrix
A sparse square triangular matrix. Should be in CSR format.
b : (M,) or (M, N) array_like
Right-hand side matrix in A x = b
lower : bool, optional
Whether A is a lower or upper triangular matrix. Default is lower triangular matrix.
overwrite_A : bool, optional
Allow changing A. The indices of A are going to be sorted and zero entries are going to be removed. Enabling gives a performance gain. Default is False.
overwrite_b : bool, optional
Allow overwriting data in b. Enabling gives a performance gain. Default is False.
x : (M,) or (M, N) ndarray
Solution to the system A x = b. Shape of return matches shape of b.
If A is singular or not triangular.
If shape of A or shape of b do not match the requirements.
New in version 0.19.0.