-
Archives
- November 2024
- September 2024
- March 2024
- January 2024
- November 2023
- October 2023
- September 2023
- June 2023
- April 2023
- March 2023
- February 2023
- December 2022
- October 2022
- September 2022
- July 2022
- June 2022
- May 2022
- December 2021
- November 2021
- October 2021
- September 2021
- August 2021
- July 2021
- April 2021
- March 2021
- January 2021
- December 2020
- October 2020
- August 2020
- April 2020
- March 2020
- February 2020
- November 2019
- July 2019
- June 2019
- April 2019
- March 2019
- February 2019
- January 2019
- December 2018
- October 2018
- April 2018
- February 2018
- November 2017
- September 2017
- July 2017
- June 2017
- May 2017
- April 2017
- March 2017
- February 2017
- January 2017
- December 2016
- November 2016
- August 2016
- July 2016
- June 2016
- May 2016
- March 2016
- February 2016
- January 2016
- December 2015
- November 2015
- October 2015
- September 2015
- August 2015
- June 2015
- May 2015
- April 2015
- March 2015
- January 2015
- December 2014
- November 2014
- October 2014
- September 2014
- August 2014
- July 2014
- June 2014
- May 2014
- April 2014
- March 2014
- February 2014
- January 2014
- December 2013
- November 2013
- October 2013
- September 2013
- August 2013
- July 2013
- June 2013
- May 2013
- March 2013
- February 2013
- January 2013
- December 2012
- November 2012
- October 2012
- August 2012
- July 2012
- June 2012
- May 2012
- April 2012
- March 2012
- February 2012
- January 2012
- December 2011
- November 2011
- October 2011
- August 2011
- July 2011
- June 2011
- May 2011
- April 2011
- March 2011
- February 2011
- January 2011
- December 2010
- November 2010
- October 2010
- September 2010
- August 2010
- July 2010
- June 2010
- May 2010
- April 2010
- March 2010
- February 2010
- January 2010
- December 2009
- November 2009
- October 2009
- September 2009
- August 2009
- July 2009
- June 2009
- May 2009
- April 2009
- March 2009
- February 2009
- January 2009
- December 2008
- November 2008
- October 2008
- September 2008
- August 2008
- July 2008
- June 2008
- May 2008
- April 2008
- March 2008
- February 2008
- January 2008
- December 2007
- November 2007
- October 2007
- September 2007
- August 2007
- July 2007
- June 2007
- May 2007
- April 2007
- March 2007
- February 2007
- January 2007
- December 2006
- November 2006
- October 2006
- September 2006
- August 2006
- July 2006
- June 2006
- May 2006
- April 2006
- March 2006
- February 2006
- January 2006
- December 2005
- November 2005
- October 2005
- September 2005
- August 2005
- July 2005
- June 2005
- May 2005
- April 2005
- March 2005
- February 2005
- January 2005
- December 2004
- November 2004
- October 2004
- September 2004
- August 2004
- July 2004
- June 2004
- May 2004
- April 2004
- March 2004
- February 2004
- January 2004
- December 2003
- November 2003
- October 2003
- September 2003
- August 2003
- July 2003
- June 2003
- May 2003
- April 2003
- March 2003
- February 2003
- January 2003
- December 2002
- November 2002
- October 2002
- September 2002
- August 2002
- July 2002
- June 2002
- May 2002
- April 2002
- March 2002
- February 2002
-
Meta
Category Archives: sciences
un-meander
Here, each curve hits alternate dots: first exactly (above), then with offsets pushing it toward the other curve. Below is the result of eight iterations. With enough iterations, the top of ‘s’ eventually gets a more symmetrical arch, as the … Continue reading
Posted in curve-fitting
Leave a comment
meander
(Previously: 2014, 2011, 2010; also, less closely related, 2015) I tried to smoothen a stroke by shifting each dot toward the Euler spiral (aka clothoid, aka Cornu spiral) determined by its four nearest neighbors. That didn’t work so well: small … Continue reading
Posted in curve-fitting
2 Comments
mutant dragons
In 2007 I thought of a pretty way to paint a square so that all pixels are different, but similar colors are clustered. For each pixel, set x,y to its coordinates; if their sum is odd, set the low bit … Continue reading
Posted in eye-candy, mathematics
Leave a comment
how (some) fireflies do it
Fireflies in Borneo have a wonderfully simple and distributed way of synchronizing their blinks. If I had the skill I’d make a screensaver of it. A couple of ways to play with the concept: I wouldn’t expect all bugs to … Continue reading
Posted in sciences
Leave a comment
what, more links?
Hm, the first two links here have been lying around for five years; guess I ought to shove them out. Pascal-Emmanuel Gobry on restructuring the banks “Zomia”, a large region in Asia that was effectively stateless until recently James Leroy … Continue reading
Posted in economics, politics
Leave a comment
points problems pointers problems
Two-fifths of the links in my sphere arrangements page were broken. Ouch! I found new addresses for a few of them, and used the Wayback Machine for the rest.
Posted in mathematics
Leave a comment
adaptive sampling
I got an interesting idea today. As you may already know, I’ve been making models of Klein bottles an’ stuff; heretofore they’ve all been in the form of bent rods, but where possible I’d prefer a continuous surface. (A hollow … Continue reading
Posted in mathematics
2 Comments