SSYSWAPR applies an elementary permutation on the rows and the columns of


 a symmetric matrix.

UPLO

          UPLO is 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

          N is INTEGER


          The order of the matrix A.  N >= 0.

A

          A is 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

          LDA is INTEGER


          The leading dimension of the array A.  LDA >= max(1,N).

I1

          I1 is INTEGER


          Index of the first row to swap

I2

          I2 is INTEGER


          Index of the second row to swap

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September 2012