ZLAUU2 - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK auxiliary routine (version 3.2)
Note : LAPACK auxiliary routine (version 3.2)
NAMEZLAUU2 - computes the product U * U' or L' * L, where the triangular factor U or L is stored in the upper or lower triangular part of the array A
SYNOPSISSUBROUTINE ZLAUU2(  UPLO, N, A, LDA, INFO )  CHARACTER UPLO  INTEGER INFO, LDA, N  COMPLEX*16 A( LDA, * )
PURPOSEZLAUU2 computes the product U * U' or L' * L, where the triangular factor U or L is stored in the upper or lower triangular part of the array A. If UPLO = 'U' or 'u' then the upper triangle of the result is stored, overwriting the factor U in A.
If UPLO = 'L' or 'l' then the lower triangle of the result is stored, overwriting the factor L in A.
This is the unblocked form of the algorithm, calling Level 2 BLAS.
ARGUMENTSUPLO (input) CHARACTER*1  Specifies whether the triangular factor stored in the array A is upper or lower triangular:
= 'U': Upper triangular
= 'L': Lower triangular N (input) INTEGER  The order of the triangular factor U or L. N >= 0. A (input/output) COMPLEX*16 array, dimension (LDA,N)  On entry, the triangular factor U or L. On exit, if UPLO = 'U', the upper triangle of A is overwritten with the upper triangle of the product U * U'; if UPLO = 'L', the lower triangle of A is overwritten with the lower triangle of the product L' * L. LDA (input) INTEGER  The leading dimension of the array A. LDA >= max(1,N). INFO (output) INTEGER  = 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value 0
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