Archive for May, 2006

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Tuesday, May 30th, 2006

Webpages as graphs

“Websites as Graphs” is a cool idea to give a graphical depiction of the structure of a webpage. Each node in the graph represents a tag in the page. The graph is a tree with the HTML tag of the page as the root. The webpage parser can take any URL and make a graph […]

2 Comments » - Posted in Visualization by

Friday, May 26th, 2006

mySociety: Travel-time maps

mySociety has produced a set of beautiful color-coded maps of travel-times (red for near, blue for far) by public transit from a given location. They have produced a few maps with fixed starting locations (all in the UK) at various scales. This is a interesting concept; it will be useful for me when I can […]

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Thursday, May 25th, 2006

Dashboard widget: 1RM

1RM (“one rep maximum”) is a Dashboard widget for Mac OS X 10.4 “Tiger” that calculates the maximum amount you can lift given a submaximum lift. So for example, if I can lift 75 pounds 10 times, then according to the widget below, I should be able to lift 100 pounds once (as seen in […]

7 Comments » - Posted in Mac by

Thursday, May 18th, 2006

Tags for IDLdoc’ed code

The previous article about IDLdoc showed how to get and run IDLdoc on your library without changing any of your code. Now, what if you are willing to add special tags to your comments for IDLdoc’s use? So here is just the header of the MG_N_SMALLEST routine with a few of the most common tags […]

1 Comment » - Posted in IDL,IDLdoc by

Monday, May 15th, 2006

Bridge suicide map

This graphic is a bit morbid, but is well done and quite powerful. It indicates the location of each suicide off the Golden Gate Bridge from the time it opened in 1937. A related graphic presents deaths per year. Two pieces of data I kept wishing were displayed were the height of the bridge at […]

1 Comment » - Posted in Visualization by

Thursday, May 11th, 2006

SGI Files Chapter 11 Bankruptcy

I wonder what SGI’s chapter 11 filing (Slashdot and Yahoo!) will do for IDL support for SGI workstations? Dennis P. McKenna, the recently appointed, Chairman and CEO of SGI seemed optimistic about SGI’s future. From the Yahoo! article, McKenna said: We expect to proceed quickly and will emerge from these proceedings with a significantly improved […]

No Comments » - Posted in IDL by

Wednesday, May 10th, 2006

The TEMPORARY function

The TEMPORARY routine is a simple way to use memory more efficiently. Statements of the form a = a + 5 create a temporary variable to hold the intermediate result a + 5. This temporary variable effectively doubles the amount of memory needed to store a (but only for the time necessary to do the […]

6 Comments » - Posted in IDL,Optimization by

Friday, May 5th, 2006

Cassini-Huygens Titan landing movie

This movie shows a lot of information about the Huygens probe as it lands on Titan. See the movie’s page for a description of the data sets visualized. I think this is an amazing piece of work. From the perspective of the design of the visualization, there are two things I find interesting about this […]

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Thursday, May 4th, 2006

Subscribe! It’s free…

RSS is a web technology to allow for distribution of regularly published information: web pages, audio/video files, PDFs, etc. The main advantage is that subscribers easily see when new material is posted. There are many applications, known as aggregators, which will watch an RSS feed and list all the content available from each site. Popular […]

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Tuesday, May 2nd, 2006

An Introduction to Programming with IDL by Kenneth P. Bowman

There aren’t many third party IDL books: David Fanning has one, Liam Gumley has one, and Ronn Kling has three. Now Ken Bowman, a professor at Texas A&M University in the Department of Atmospheric Sciences, enters the fray with An Introduction to Programming with IDL. This book is geared towards a new user of IDL […]

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