Computes the LU factorization of a general band matrix using the unblocked version of the algorithm.
Tests input for NaN.
Used by ?stedc. Merges eigenvalues and deflates secular equation. Used when the original matrix is dense.
Forms a matrix containing Kronecker products between the given matrices.
Returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a complex Hermitian matrix supplied in packed form.
Computes a QR factorization with column pivoting of the matrix block.
Applies a block reflector or its transpose/conjugate-transpose to a general rectangular matrix.
Finds a new relatively robust representation such that at least one of the eigenvalues is relatively isolated.
Computes the SVD of an upper bidiagonal matrix B of the specified size. Used by ?bdsdc.
Computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by ?bdsqr.