Provided by: liblapack-doc_3.8.0-2_all

**NAME**

double_eig

**SYNOPSIS**

Functionssubroutinedlarfy(UPLO, N, V, INCV, TAU, C, LDC, WORK)DLARFY

**Detailed** **Description**

This is the group of double LAPACK TESTING EIG routines.

**Function** **Documentation**

subroutinedlarfy(characterUPLO,integerN,doubleprecision,dimension(*)V,integerINCV,doubleprecisionTAU,doubleprecision,dimension(ldc,*)C,integerLDC,doubleprecision,dimension(*)WORK)DLARFYPurpose:DLARFY applies an elementary reflector, or Householder matrix, H, to an n x n symmetric matrix C, from both the left and the right. H is represented in the form H = I - tau * v * v' where tau is a scalar and v is a vector. If tau is zero, then H is taken to be the unit matrix.Parameters:UPLOUPLO is CHARACTER*1 Specifies whether the upper or lower triangular part of the symmetric matrix C is stored. = 'U': Upper triangle = 'L': Lower triangleNN is INTEGER The number of rows and columns of the matrix C. N >= 0.VV is DOUBLE PRECISION array, dimension (1 + (N-1)*abs(INCV)) The vector v as described above.INCVINCV is INTEGER The increment between successive elements of v. INCV must not be zero.TAUTAU is DOUBLE PRECISION The value tau as described above.CC is DOUBLE PRECISION array, dimension (LDC, N) On entry, the matrix C. On exit, C is overwritten by H * C * H'.LDCLDC is INTEGER The leading dimension of the array C. LDC >= max( 1, N ).WORKWORK is DOUBLE PRECISION array, dimension (N)Author:Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd.Date:December 2016

**Author**

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