Provided by: liblapack-doc_3.3.1-1_all
LAPACK-3 - applies an elementary permutation on the rows and the columns of a symmetric matrix
SUBROUTINE SSYSWAPR( UPLO, N, A, LDA, I1, I2) CHARACTER UPLO INTEGER I1, I2, LDA, N REAL A( LDA, N )
SSYSWAPR applies an elementary permutation on the rows and the columns of a symmetric matrix.
UPLO (input) CHARACTER*1 Specifies whether the details of the factorization are stored as an upper or lower triangular matrix. = 'U': Upper triangular, form is A = U*D*U**T; = 'L': Lower triangular, form is A = L*D*L**T. N (input) INTEGER The order of the matrix A. N >= 0. A (input/output) REAL array, dimension (LDA,N) On entry, the NB diagonal matrix D and the multipliers used to obtain the factor U or L as computed by SSYTRF. On exit, if INFO = 0, the (symmetric) inverse of the original matrix. If UPLO = 'U', the upper triangular part of the inverse is formed and the part of A below the diagonal is not referenced; if UPLO = 'L' the lower triangular part of the inverse is formed and the part of A above the diagonal is not referenced. LDA (input) INTEGER The leading dimension of the array A. LDA >= max(1,N). I1 (input) INTEGER Index of the first row to swap I2 (input) INTEGER Index of the second row to swap LAPACK auxiliary routine (version 3.3.1) April 2011 SSYSWAPR(3lapack)