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LA_PTSVX computes the solution to a linear system of equations $AX = B$, where $A$ has tridiagonal form and is real symmetric or complex Hermitian and, in either case, positive definite, and where $X$ and $B$ are rectangular matrices or vectors.
LA_PTSVX can also optionally estimate the condition number of $A$ and compute error bounds.

Susan Blackford 2001-08-19