Author Archives: dougaj4

Yet more pendulums

Posted on 24/06/2011 by dougaj4

Following Dynamically Defined Dancing Pendulums, another three versions of the dancing pendulum theme.  First a POV-RAY version by PM 2Ring, complete with reflections and shadows: POV-Ray Pendulums (click to open in a new window) and an interactive Javascript version: Javascript pendulums by PM2Ring (click … Continue reading →

Posted in Animation, Excel, Newton, Ray Tracing | Tagged , , , , | 1 Comment

Debugging VBA …

Posted on 22/06/2011 by dougaj4

… especially User Defined Functions (UDF’s). This post (and most likely several to follow) was prompted by a recent discussion at Daily Dose of Excel about various alternative debugging techniques.  It reminded me (if I had ever known) of the Debug.Assert … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , | 2 Comments

Dynamic Maps

Posted on 15/06/2011 by dougaj4

Some sites providing information about the world in the form of regularly updated maps: NASA Earth Observatory Includes regularly updated satellite images and maps of satellite obeservations: USGS Earthquake Maps: Planefinder: Locate planes equipped with satellite identification equipment, including flight … Continue reading →

Posted in Newton | Tagged , , , , | 1 Comment

High Speed Blog …

Posted on 07/06/2011 by dougaj4

… brought to you via Smurf on Spreadsheets If you want your spreadsheets to go faster, Charles Williams is the man to tell you how to do it.  Charles has recently started a blog on the subject: FastExcel Well worth … Continue reading →

Posted in Excel, VBA | Tagged , , | Leave a comment

Jaqui Mcshee

Posted on 01/06/2011 by dougaj4

Usually when I’m searching YouTube to see what new old stuff has come up I type in Jansch or Renbourn or Thompson, but today just for a change I typed Mcshee, and this is what came up: which lead to: … Continue reading →

Posted in Bach | Tagged , , , | 4 Comments