clatsy.f3

!>
!> CLATSY generates a special test matrix for the complex symmetric
!> (indefinite) factorization.  The pivot blocks of the generated matrix
!> will be in the following order:
!>    2x2 pivot block, non diagonalizable
!>    1x1 pivot block
!>    2x2 pivot block, diagonalizable
!>    (cycle repeats)
!> A row interchange is required for each non-diagonalizable 2x2 block.
!> 

UPLO

!>          UPLO is CHARACTER
!>          Specifies whether the generated matrix is to be upper or
!>          lower triangular.
!>          = 'U':  Upper triangular
!>          = 'L':  Lower triangular
!> 

N

!>          N is INTEGER
!>          The dimension of the matrix to be generated.
!> 

X

!>          X is COMPLEX array, dimension (LDX,N)
!>          The generated matrix, consisting of 3x3 and 2x2 diagonal
!>          blocks which result in the pivot sequence given above.
!>          The matrix outside of these diagonal blocks is zero.
!> 

LDX

!>          LDX is INTEGER
!>          The leading dimension of the array X.
!> 

ISEED

!>          ISEED is INTEGER array, dimension (4)
!>          On entry, the seed for the random number generator.  The last
!>          of the four integers must be odd.  (modified on exit)
!> 

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.