Computes 2-by-2 orthogonal matrices U, V, and Q, and applies them to matrices A and B such that the rows of the transformed A and B are parallel.
Returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value of any element of a general rectangular matrix.
Performs a forward or backward permutation of the columns of a matrix.
Scales a symmetric/Hermitian matrix, using scaling factors computed by ?poequ.
Given the tridiagonal matrix T, sets small off-diagonal elements to zero and for each unreduced block Ti, finds base representations and eigenvalues.
Computes the singular values of a real upper bidiagonal n-by-m matrix B with diagonal d and off-diagonal e. Used by ?bdsdc.
Checks for deflation, computes a shift and calls dqds. Used by ?bdsqr.
Solves a triangular system of equations with the scale factor set to prevent overflow.
Multiplies a vector by the reciprocal of a real scalar.
Scans a matrix for its last non-zero column.
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