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Caching for speed is a concept brand new to me, and there's a remarkable
example in a thread on the python-list. I thought some readers of this
list might find it instructive. However, to run the scripts you'll need
mpmath.
<<a href="http://code.google.com/p/mpmath/" eudora="autourl">
http://code.google.com/p/mpmath/</a>><br><br>
Begin by jumping in toward the end of the thread:<br><br>
<<a href="http://mail.python.org/pipermail/python-list/2007-November/466662.html" eudora="autourl">
http://mail.python.org/pipermail/python-list/2007-November/466662.html</a>
><br><br>
Note Fredrik Johansson's function f() that he suggests could greatly
speed up my demo of the amazing Chudnovsky algorithm for pi, at
<<a href="http://python.pastebin.com/f4410f3dc" eudora="autourl">
http://python.pastebin.com/f4410f3dc</a>>.<br><br>
I didn't understand what to do with it, so I ask,
<<a href="http://mail.python.org/pipermail/python-list/2007-November/467148.html" eudora="autourl">
http://mail.python.org/pipermail/python-list/2007-November/467148.html</a>
>. But see the revision I did make,
<<a href="http://py77.python.pastebin.com/f48e4151c" eudora="autourl">
http://py77.python.pastebin.com/f48e4151c</a>><br><br>
And his revision of that,
<<a href="http://py77.python.pastebin.com/m6b2b34b7" eudora="autourl">
http://py77.python.pastebin.com/m6b2b34b7</a>>.<br><br>
As for the speed-up on my computer due to the caching done by f():
<<a href="http://py77.python.pastebin.com/f48e4151c" eudora="autourl">
http://py77.python.pastebin.com/f48e4151c</a>> takes 151 secs for 2000
digits of pi;
<<a href="http://py77.python.pastebin.com/m6b2b34b7" eudora="autourl">
http://py77.python.pastebin.com/m6b2b34b7</a>> takes 0.4
secs!<br><br>
Dick Moores<br>
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