.TH DLAUUM 1 "November 2006" " LAPACK auxiliary routine (version 3.1) " " LAPACK auxiliary routine (version 3.1) " .SH NAME DLAUUM - the product U * U\(aq or L\(aq * L, where the triangular factor U or L is stored in the upper or lower triangular part of the array A .SH SYNOPSIS .TP 19 SUBROUTINE DLAUUM( UPLO, N, A, LDA, INFO ) .TP 19 .ti +4 CHARACTER UPLO .TP 19 .ti +4 INTEGER INFO, LDA, N .TP 19 .ti +4 DOUBLE PRECISION A( LDA, * ) .SH PURPOSE DLAUUM computes the product U * U\(aq or L\(aq * L, where the triangular factor U or L is stored in the upper or lower triangular part of the array A. If UPLO = \(aqU\(aq or \(aqu\(aq then the upper triangle of the result is stored, overwriting the factor U in A. .br If UPLO = \(aqL\(aq or \(aql\(aq then the lower triangle of the result is stored, overwriting the factor L in A. .br This is the blocked form of the algorithm, calling Level 3 BLAS. .SH ARGUMENTS .TP 8 UPLO (input) CHARACTER*1 Specifies whether the triangular factor stored in the array A is upper or lower triangular: .br = \(aqU\(aq: Upper triangular .br = \(aqL\(aq: Lower triangular .TP 8 N (input) INTEGER The order of the triangular factor U or L. N >= 0. .TP 8 A (input/output) DOUBLE PRECISION array, dimension (LDA,N) On entry, the triangular factor U or L. On exit, if UPLO = \(aqU\(aq, the upper triangle of A is overwritten with the upper triangle of the product U * U\(aq; if UPLO = \(aqL\(aq, the lower triangle of A is overwritten with the lower triangle of the product L\(aq * L. .TP 8 LDA (input) INTEGER The leading dimension of the array A. LDA >= max(1,N). .TP 8 INFO (output) INTEGER = 0: successful exit .br < 0: if INFO = -k, the k-th argument had an illegal value