`scipy.linalg._flapack:ctbtrs`

Signature

def ctbtrs(ab, b, uplo = U, trans = N, diag = N, overwrite_b = 0)

Solve a triangular band system (LAPACK ctbtrs).

ab : ndarray: The band of the triangular matrix, shape (kd + 1, n): the order n and the bandwidth kd are both read off ab itself.
b : ndarray: Right-hand side(s) of shape (n, nrhs).
uplo : str, optional: 'U' if the matrix is upper triangular, 'L' if lower. Default is 'U'.
trans : str, optional: 'N', 'T' or 'C' for the system, its transpose, or its conjugate transpose. Default is 'N'.
diag : str, optional: 'U' if the matrix has a unit diagonal, 'N' otherwise. Default is 'N'.
overwrite_b : int, optional: If nonzero, b may be overwritten in place. Default is 0.

x : ndarray: Solution of the system, overwriting b.
info : int: 0 on success; if negative, the -info-th argument had an illegal value.