Path: news.mathworks.com!not-for-mail
From: "Tim Davis" <davis@cise.ufl.edu>
Newsgroups: comp.soft-sys.matlab
Subject: Re: MATLAB name puns/puzzles
Date: Thu, 9 Aug 2007 18:23:45 +0000 (UTC)
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"Tim Davis" <davis@cise.ufl.edu> wrote in message
<f9870k$fm1$1@fred.mathworks.com>...
> Here are a few MATLAB puns.  The answer to each is the name
> of a MathWorker.  You must also explain why.  Answers will
> appear after a while.
> 
> R = qr (6.02214179e+23)
> schur (L|n)
> load penny ; and (find (r == etree (P)))
> P*A'+Q*U*L(:,n)
> save perrier psi(weekday(3))
> edge (convhull, 'canny')
> swapbytes (j:k)
> 
> The last one (an operator, not a complete command) isn't a
> MathWorker:
> 
> ( )'*eye(m)\( )
> 
> Have fun!

The answers are below (scroll down).
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R = qr (6.02214179e+23)

   The qr factorization of Avagadro's number (a mole),
   or the mole R.  The mole is cleaved into its factors.
   ... Cleve Moler

schur (L|n)

   The Schur complement of L or en ... Loren Shure.

load penny ; and (find (r == etree (P)))

    With Penny.dat, compute the etree.  Then f(r==etree(P))
    returns a list of nodes that are the sons of R, which
    are then and'ed together.  ... Penny Anderson

P*A'+Q*U*L(:,n)

    Pat Quillen

save perrier psi(weekday(3))

    weekday(3) is "Mon" (Monday), and psi(mon) then gets
    saved into perrier.mat, or eau.mat.  psi(mon) eau.mat
    .... Matt Simoneau

edge (convhull, 'canny')

    edge(..,'canny') uses the Derivative Of Uh Gaussian
    (or DOUG), applied to the convex Hull ... Doug Hull.

swapbytes (j:k)

    "doc colon" uses the j:k example, which would be
    pronounced "Jack".  Then swapbytes computes the Little-
    endian form.  ... Jack Little.


The last one (an operator, not a complete command) isn't a
MathWorker:

( )'*eye(m)\( )

    '*eye(m) == Tim.  Then you've heard of the Gaussian,
    Laplacian, etc?  Well, it was a mathematical ancestor
    of mine that invented the Davissian operator, which has
    been corrupted over the years to "division" (OK, not
    really, but it makes a nice pun anyway).
    ... Tim Davis


eye(vander(why))?