# naginterfaces.library.lapacklin.ztrtrs¶

naginterfaces.library.lapacklin.ztrtrs(uplo, trans, diag, a, b)[source]

ztrtrs solves a complex triangular system of linear equations with multiple right-hand sides, , or .

For full information please refer to the NAG Library document for f07ts

https://support.nag.com/numeric/nl/nagdoc_30.1/flhtml/f07/f07tsf.html

Parameters
uplostr, length 1

Specifies whether is upper or lower triangular.

is upper triangular.

is lower triangular.

transstr, length 1

Indicates the form of the equations.

The equations are of the form .

The equations are of the form .

The equations are of the form .

diagstr, length 1

Indicates whether is a nonunit or unit triangular matrix.

is a nonunit triangular matrix.

is a unit triangular matrix; the diagonal elements are not referenced and are assumed to be .

acomplex, array-like, shape

The triangular matrix .

bcomplex, array-like, shape

The right-hand side matrix .

Returns
bcomplex, ndarray, shape

The solution matrix .

Raises
NagValueError
(errno )

On entry, error in parameter .

Constraint: or .

(errno )

On entry, error in parameter .

Constraint: , or .

(errno )

On entry, error in parameter .

Constraint: or .

(errno )

On entry, error in parameter .

Constraint: .

(errno )

On entry, error in parameter .

Constraint: .

Warns
NagAlgorithmicWarning
(errno )

Element of the diagonal is exactly zero. is singular and the solution has not been computed.

Notes

ztrtrs solves a complex triangular system of linear equations , or .

References

Golub, G H and Van Loan, C F, 1996, Matrix Computations, (3rd Edition), Johns Hopkins University Press, Baltimore

Higham, N J, 1989, The accuracy of solutions to triangular systems, SIAM J. Numer. Anal. (26), 1252–1265