[sci.math.num-analysis] code to update LDL' matrix factorizations

dhw@itivax.iti.org (David H. West) (04/21/89)

Can anyone give me pointers to the source code of the Harwell
routine MC11A (up/down-date LDL' matrix factorizations, by Fletcher and
Powell) or equivalent?

Is the Harwell library available by FTP or mailserver?

(The 'usual' case is straightforward to code from their paper, but the 
case of enforced rank change is tricky.)

Thanks in advance,

-David West            dhw@itivax.iti.org
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COMPIS, Industrial Technology Institute, PO Box 1485, 
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