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- From: a_rubin@dsg4.dse.beckman.com (Arthur Rubin)
- Newsgroups: sci.math
- Subject: Re: A matrix anti-derivative puzzle
- Message-ID: <a_rubin.715288791@dn66>
- Date: 31 Aug 92 19:19:51 GMT
- References: <52675@dime.cs.umass.edu>
- Distribution: usa
- Lines: 27
- Nntp-Posting-Host: dn66.dse.beckman.com
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- In <52675@dime.cs.umass.edu> bradtke@greed.cs.umass.edu writes:
-
-
- >I have a problem involving the anti-derivative of a matrix function.
- >I would like to find a function F such that
-
- >dF/dw = - G'w
-
- >or
-
- >dF/dw = (G - G')w,
-
- >where G is a nonsymmetric matrix, and w is a vector.
- >The quadratic form F = w'Gw gives, of course, dF/dw = (G+G')w.
-
- The equation d^2F/dw_i/dw_j = d^2F/dw_j/dw_i gives us that if G is a constant
- matrix, and
-
- dF/dw = G' w,
-
- then G is symmetric.
-
- --
- Arthur L. Rubin: a_rubin@dsg4.dse.beckman.com (work) Beckman Instruments/Brea
- 216-5888@mcimail.com 70707.453@compuserve.com arthur@pnet01.cts.com (personal)
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