Drapery and rod finally reinstalled - master bedroom

After replacing the flooring and painting the room, I wanted to put the drapes back up.  They came with house but are ok for now.  Unfortunately, I misplaced something or thought I did - too embarrassed to admin what exactly.  Anyways, once I got it sorted out I was able to get everything put back into place.  I had done some significant patching where it was attached to the wall before and this time I used some deck screws with the star shaped heads (T20?) since I have had a number of issues with Phillips head screws stripping out elsewhere. This worked perfectly.

I had painted the finials on the ends of the bar to match the trim in the room.  I haven't painted the actual bar yet - well see if I do, it isn't a high priority.

There are blinds as well which is good thing. The drapes just darken the room a bit extra against some mid-morning sun.

I got this done around new years or so - still some more work to do in the master bedroom but it isn't a total mess now.

Pioneer Mini-split heat pump arrives

My new mini-split heat pump has arrived!  This is for my office for which the main house AC is connected to but the location lacks temperature control.  With no temp control and the hot water heater located in the room, it gets extremely warm. It is difficult to work (or interview) when the room is in the upper 80's.  It is a 9000 btu unit which should be more than adequate for my office.

I just need to take the time to install it now.  I ended up getting a wall mounted unit - I  was going to get a ceiling cassette model but decided the extra cost/complexity to install it was too much.

 

Here is a link over to the Pioneer site.

I'm hoping some things are a little easier after getting this in installed. I'll have to blog a bit on the install once done.

John 14:1 Do not let your hearts be troubled. You believe in God; believe also in me.  (NIV)

Graphing Prime Numbers

I enjoy toying with prime numbers and wanted to see how the Java GraphStream library worked.  Here is a short video of the result. 

 

 

Interestingly, it is little fun projects like this that often turn into moments of learning.  While working on some prime number related programs I learned of some tool limits I wasn't aware of before this.

•  The max radix value for converting numbers to strings is 36.  From some searching, it sounds like that was chosen by being the number of values 0-9 + the 26 case-insensitive values a-z.  I found it odd when numbers I converted starting at radix 37 were identical.
• Integer.toString(99999, 37)
  
•  For a call to: com.google.common.collect.Sets.powerSet( aSet) , the "aSet" set parameter is limited to a max of 30 items.

 

 

I decided to try a variety of layout parameters to look for interesting results.  Here are a few of those results using GraphStream.

 

 Those were interesting but I decided to see if I could integrate different graphing libraries to look for other interesting features, etc.

My first attempt was to try integrating gephi but that didn't go well.   As I looked into other graphing libraries, I noted that many are not maintained.  This took way too much effort due to the version of netbeans libraries that had been used.  I ended up forcing newer versions which are hosted by Apache.  Eventually, I had code that built but no visual graph was produced - I noted some flakiness with one of my displays when trying to run it so I suspect an issue between older code and my display/drivers.  

Next, I decided to try Jgrapht.  This had an initial snag which was the fact that the original package was no longer maintained and wasn't available via maven.  I ended up finding a version that is either a fork or repackaging of it and is available via maven.  Now, things were much less difficult.  It also resulted in very few total dependencies - even after I reworked the code significantly and added in the picocli lib for command line arg handling. I also ended up needing to add in the jgrapht-ext and jgraphx libs to display resulting graphs.

Here are a couple examples from that. The first uses the pre-canned compact tree layout. It took some playing to get something useful to display though. The second graph uses the pre-canned circle layout and that was easy to setup but still not as visually appealing as I desired.

I'll keep looking and trying new settings to see if I can come up with something better but this does work at least.  From a visual graph standpoint, it doesn't scale very well it seems but maybe some tuning is possible.  I got the generation of the primes tuned much better now and could generate 1M primes quickly but trying to graph even 10k primes seems unrealistic / painful.  I'll probably end up terminating the running process before it ever gets to the point of displaying the graph.

[update] I added the ability to export my data into the Graph Modelling Language (GML) format and that is compatible with the yed tool. Yed has much richer layout support that what I have been working with from a Java library integration standpoint.  The downside is that really large datasets are time consuming to visualize.  I'm not sure how long it took for yed to complete this since I took a several hour break.  This was for 10k primes.