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Man Pages
TESTING/EIG/sget54.f(3) LAPACK TESTING/EIG/sget54.f(3)

TESTING/EIG/sget54.f


subroutine sget54 (n, a, lda, b, ldb, s, lds, t, ldt, u, ldu, v, ldv, work, result)
SGET54

SGET54

Purpose:


SGET54 checks a generalized decomposition of the form
A = U*S*V' and B = U*T* V'
where ' means transpose and U and V are orthogonal.
Specifically,
RESULT = ||( A - U*S*V', B - U*T*V' )|| / (||( A, B )||*n*ulp )

Parameters

N


N is INTEGER
The size of the matrix. If it is zero, SGET54 does nothing.
It must be at least zero.

A


A is REAL array, dimension (LDA, N)
The original (unfactored) matrix A.

LDA


LDA is INTEGER
The leading dimension of A. It must be at least 1
and at least N.

B


B is REAL array, dimension (LDB, N)
The original (unfactored) matrix B.

LDB


LDB is INTEGER
The leading dimension of B. It must be at least 1
and at least N.

S


S is REAL array, dimension (LDS, N)
The factored matrix S.

LDS


LDS is INTEGER
The leading dimension of S. It must be at least 1
and at least N.

T


T is REAL array, dimension (LDT, N)
The factored matrix T.

LDT


LDT is INTEGER
The leading dimension of T. It must be at least 1
and at least N.

U


U is REAL array, dimension (LDU, N)
The orthogonal matrix on the left-hand side in the
decomposition.

LDU


LDU is INTEGER
The leading dimension of U. LDU must be at least N and
at least 1.

V


V is REAL array, dimension (LDV, N)
The orthogonal matrix on the left-hand side in the
decomposition.

LDV


LDV is INTEGER
The leading dimension of V. LDV must be at least N and
at least 1.

WORK


WORK is REAL array, dimension (3*N**2)

RESULT


RESULT is REAL
The value RESULT, It is currently limited to 1/ulp, to
avoid overflow. Errors are flagged by RESULT=10/ulp.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 154 of file sget54.f.

Generated automatically by Doxygen for LAPACK from the source code.

Sun Jan 12 2025 15:13:33 Version 3.12.1

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