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The Jabberwock, by Sir John Tenniel (1820-1914). |
west0479, a well-behaved matrix for direct methods, but according to John Gilbert, a horror matrix for iterative methods. Try "load west0479" in MATLAB. It comes from a chemical engineering application, but doesn't it look like it has claws? And a spiky tail? (image created by cspy). A tiny version of this matrix forms the favicon for my web site: |
| Jabberwocky, by Lewis Carroll. | Horror Matrices for Direct Methods, by T. D. | |
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'Twas brillig, and the slithy toves Did gyre and gimble in the wabe; All mimsy were the borogoves, And the mome raths outgrabe.
'Beware the Jabberwock, my son!
He took his vorpal sword in hand:
And as in uffish thought he stood,
One, two! One, two! And through and through
'And hast thou slain the Jabberwock?
'Twas brillig, and the slithy toves |
`Twas
fill-in,
and the slow
transpose
Did dir'ect factor in archive All tipsy were the banded 'ones And memory paths outgave.
"Beware the 'OrrorMat, my son!
He took his direct
slash
in hand:
And as in
out-core work he stood,
For
one! to n! and 'til the
end
"And hast thou slain the 'OrrorMat?
`Twas
fill-in,
and the slow
transpose |
See also a glossary.
Copyright 2006, Tim Davis. Please don't copy-and-paste or hot-link this poem without permission; link to this page instead: http://www.cise.ufl.edu/~davis/Poetry/horror.html
If you like this poem, you can find more poems at Horror Matrices and Other Mathematical Poetry. Click here for an index of my serious poetry.