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LA_STEVR computes selected eigenvalues and, optionally, the corresponding eigenvectors of a real symmetric tridiagonal matrix $A$. Eigenvalues and eigenvectors can be selected by specifying either a range of values or a range of indices for the desired eigenvalues.
LA_STEVR uses a relatively robust representation (RRR) algorithm. It is usually the fastest algorithm of all and uses the least workspace.

Susan Blackford 2001-08-19