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[Lapack] fast condition number of nonsquare matrix

 I want to get a fast approximation for a condition number
of a general non square matrix. Or at least it's smaller
singular value. SVD is too heavy for me.

1) Is there faster methods via lapack, than SVD ?
2) If I can provide a pretty good initial guess for cond or
   singular value - can I gain from it ?

Thank you,

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