The skip list is my favorite data type. This may be because of some exposure to AVL trees back during my college days. Self balancing trees are wonderful, but they can be difficult to reason about. If someone was to ask me what goes on when a value is inserted or deleted from an AVL tree, my answer would probably be “magic occurs”, and frankly, its magic I don’t care to dabble in.
Skip lists, on the other hand, are built on nice, classic linked lists. Linked lists get a bad rap when compared to List structures backed by an array, but they have their advantages. When comparing them to trees, it is important to realize that the trees are linked lists themselves. (more…)
While out and about today and still looking for the perfect prairie grass I took highway 53 back rather than 93 (I already knew what was on 93 from an earlier trip). While I didn’t find the ideal clump of prairie grass, I did find a nice turnout, with a good view, that was westward looking.
September 11, 2014
Fall Colors, Photography, Travel, Waterfalls
Baraboo, foliage, geo:lat=43.450064278405904, geo:lon=-89.78898755344238, geotagged, pewits nest, waterfall
The fall color report on Travel Wisconsin has had a tantalizing photograph on its gallery from last year. So, I decided to head down to figure out what some of the buttons on the new camera does and how to use them before I need to use them. So, a trip to Pewit’s Nest was in order.
For some reason, the designers of Java decided to make
+= work with Strings. These are the only Objects in Java that have an overloaded operator that turns out to do some magic behind the scenes.
You see it all over the place:
String foo = bar + qux + "\n" + 42;
But when is this acceptable when when is it problematic?
One may notice that my pictures of photographing waterfalls are often tight shots of part of the waterfall. There are two components to this choice – practical and the aesthetic.
And up and leaving from Baraga. There isn’t too much to say about this other than that I stopped by Bond Falls on the way back home.
I got into Bond Falls at about 10am. Fortunately, the mosquitos weren’t out and ravenous as they were the previous afternoon. However, the sun was shining on much of the falls creating some very large dynamic ranges on the scene making it very difficult to photograph… and so I continued home. That’s about it.
Need to update my library and post some of the photographs from the trip.
The day started out with a search for some insect repellant. This has been a very buggy season – lots and lots of mosquitoes. Started at the local mini-department store, but they were completely sold out. After a bit of an excursion, found that there was only about a dozen cans of Deet based in the local gas station camping section and another dozen cans of permethrin at the local sporting goods – thats it in town and likely the county.
The weather is finally right for a trip up to the upper peninsula – enough foliage on the trees, not too late in the season for the falls to go a bit dry… its time for drive.
Recently I stumbled across a question of “write a program to calculate the number of trailing zeros in
n!” For example, 5! = 1 * 2 * 3 * 4 * 5 = 120. Thus, the number to get out of the program is 1. 10! is 3628800, and should get the result of 2.
I have a few cameras. One in particular I haven’t had a chance to play with… yet. Its a Lytro camera that has the ability to capture some of the three dimensional information about the scene (rather than just the flat focus plane).