Jens Axel Søgaard wrote most of the linear algebra functions; he's the
high-caliber guy to thank for `matrix-solve'. In case he doesn't pop in
here to say it himself, you're very welcome. :)
Neil ⊥
On 04/22/2013 01:21 PM, Richard Cleis wrote:
Recently I used it for estimating orientation parameters of
telescopes. Inputs are the locations of stars, outputs are telescope
coordinates, parameters describe the relationship of axes to each other
and to the earth.
In matrix-solve, MX=B are
M : J[transpose]J, where the J matrix is filled with numerically
computed derivatives of each parameter vs outputs.
B : J[transpose]E, where E is filled with the errors in each axis as
measured by observing stars
X : the changed in parameters that are to be solved on each iteration of
the estimator
Due to numerous orthogonal components and parallel parameters (for
certain pointing directions), the matrix library has to be rigorously
written, else the iterations die of round-off errors etc. I had several
choices, but given the high caliber people that write Racket code, I
figured I could go with matrix-solve and expect it to work.
rac
On Apr 21, 2013, at 11:11 AM, Joe Gilray wrote:
Yes, the math library is awesome. Many thanks.
Richard, what are you using it for? (if you are liberty to say, of
course).
-joe
On Sat, Apr 20, 2013 at 8:28 PM, Richard Cleis <[email protected]
<mailto:[email protected]>> wrote:
Thanks for the math library. I started using some of the linear
algebra functions for my paid programming, and have had zero
trouble with any of it. Matrix-solve works like a dream, and the
docs are on the mark.
I have to wonder what would happen if a program manager were
looking over my shoulder on the rare occasion that I commit a
Contract Violation for issues like non-invertible matrices. PMs
are a humorless lot in regards to violation of contractual terms.
rac
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