DLASET initializes an m-by-n matrix A to BETA on the diagonal and


 ALPHA on the offdiagonals.

UPLO

          UPLO is CHARACTER*1


          Specifies the part of the matrix A to be set.


          = 'U':      Upper triangular part is set; the strictly lower


                      triangular part of A is not changed.


          = 'L':      Lower triangular part is set; the strictly upper


                      triangular part of A is not changed.


          Otherwise:  All of the matrix A is set.

M

          M is INTEGER


          The number of rows of the matrix A.  M >= 0.

N

          N is INTEGER


          The number of columns of the matrix A.  N >= 0.

ALPHA

          ALPHA is DOUBLE PRECISION


          The constant to which the offdiagonal elements are to be set.

BETA

          BETA is DOUBLE PRECISION


          The constant to which the diagonal elements are to be set.

A

          A is DOUBLE PRECISION array, dimension (LDA,N)


          On exit, the leading m-by-n submatrix of A is set as follows:


          if UPLO = 'U', A(i,j) = ALPHA, 1<=i<=j-1, 1<=j<=n,


          if UPLO = 'L', A(i,j) = ALPHA, j+1<=i<=m, 1<=j<=n,


          otherwise,     A(i,j) = ALPHA, 1<=i<=m, 1<=j<=n, i.ne.j,


          and, for all UPLO, A(i,i) = BETA, 1<=i<=min(m,n).

LDA

          LDA is INTEGER


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

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NAG Ltd.

September 2012