Reduces the first
nbrows and columns of a symmetric/Hermitian matrix
Ato real tridiagonal form by an orthogonal/unitary similarity transformation.
nbrows and columns of a real symmetric or complex Hermitian matrix sub(
to symmetric/complex tridiagonal form by an orthogonal/unitary similarity transformation
, and returns the matrices
W, which are needed to apply the transformation to the unreduced part of sub(
p?latrdreduces the last
nbrows and columns of a matrix, of which the upper triangle is supplied;
p?latrdreduces the first
nbrows and columns of a matrix, of which the lower triangle is supplied.
- (global)CHARACTER.Specifies whether the upper or lower triangular part of the symmetric/Hermitian matrix sub(A) is stored:='U': Upper triangular=L: Lower triangular.
- (global)INTEGER.The number of rows and columns to be operated on, that is, the order of the distributed matrix sub(A)..n≥0