?stedc. Merges eigenvalues and deflates secular equation. Used when the original matrix is dense.
The routine merges the two sets of eigenvalues together into a single sorted set. Then it tries to deflate the size of the problem. There are two ways in which deflation can occur: when two or more eigenvalues are close together or if there is a tiny element in the
zvector. For each such occurrence the order of the related secular equation problem is reduced by one.
- INTEGER. Used with real flavors only.If, compute eigenvalues only.icompq= 0If, compute eigenvectors of original dense symmetric matrix also.icompq= 1On entry, the arrayqmust contain the orthogonal matrix used to reduce the original matrix to tridiagonal form.
- INTEGER. The dimension of the symmetric tridiagonal matrix ().n≥0