What's New - June 2004
June 17, 2004: Here's a small update to the Scientific Grapher program with better default values if two series are being plotted and the ability to control the scale of the dependent variable. I also added Fermat's Spiral to the sample curve files.
By the way, it has been reported
that practitioners of omphaloskepsis, (contemplating one's
navel), use Fermat's Spiral as
their symbol. I'll admit though, that my
search for "Omphaloskepsis" images turned up lots of
belly buttons, but few spirals.
June 14, 2004: I've been trading problems and puzzles with a bright young lady I met at the Destination Imagination Global finals a couple of weeks ago. She sent me this one the other day: Insert +, -, x, ÷ symbols into the digits 99999 to make an expression that equals 10.
It's not too difficult to find one, but I thought she deserved to see all possible solutions. Besides, I'm trying to convince her programming would be a great career choice. So here is ExpressionsForBethe, which solves not only this problem but similar problems for any given set of digits evaluating to any given value.
June 11, 2004: Here's an update to the Computational Geometry page over in Delphi Techniques section that adds the solution to this problem: . Given a point and a polygon, determine if the point is enclosed by the polygon.
How to do it? Hint: Draw a long line from the red dot in this
image in any direction that doesn't pass through any
vertices. Notice that your line intersects an
even number of polygon edges.
I plan future updates with additions, deletions, and enhanced versions, so pertinent feedback with bugs reports or suggestions will be appreciated as always.
Copyright © 2000-2013, Gary Darby
All rights reserved.