SLATTB generates a triangular test matrix in 2-dimensional storage.


 IMAT and UPLO uniquely specify the properties of the test matrix,


 which is returned in the array A.

IMAT

          IMAT is INTEGER


          An integer key describing which matrix to generate for this


          path.

UPLO

          UPLO is CHARACTER*1


          Specifies whether the matrix A will be upper or lower


          triangular.


          = 'U':  Upper triangular


          = 'L':  Lower triangular

TRANS

          TRANS is CHARACTER*1


          Specifies whether the matrix or its transpose will be used.


          = 'N':  No transpose


          = 'T':  Transpose


          = 'C':  Conjugate transpose (= transpose)

DIAG

          DIAG is CHARACTER*1


          Specifies whether or not the matrix A is unit triangular.


          = 'N':  Non-unit triangular


          = 'U':  Unit triangular

ISEED

          ISEED is INTEGER array, dimension (4)


          The seed vector for the random number generator (used in


          SLATMS).  Modified on exit.

N

          N is INTEGER


          The order of the matrix to be generated.

KD

          KD is INTEGER


          The number of superdiagonals or subdiagonals of the banded


          triangular matrix A.  KD >= 0.

AB

          AB is REAL array, dimension (LDAB,N)


          The upper or lower triangular banded matrix A, stored in the


          first KD+1 rows of AB.  Let j be a column of A, 1<=j<=n.


          If UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j.


          If UPLO = 'L', AB(1+i-j,j)    = A(i,j) for j<=i<=min(n,j+kd).

LDAB

          LDAB is INTEGER


          The leading dimension of the array AB.  LDAB >= KD+1.

B

          B is REAL array, dimension (N)

WORK

          WORK is REAL array, dimension (2*N)

INFO

          INFO is INTEGER


          = 0:  successful exit


          < 0: if INFO = -k, the k-th argument had an illegal value

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