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I want to implement Contraction Hierarchy (CH) shortest path in JAVA. So for reference I want some already implemented java version of this algorithm or a step by step algorithm pseudo code. So can you please give me any such reference so that I can implement it?
Well actually I know 2 projects implementing this algorithm one is written in Java and it is GraphHopper
Then other one is OSRM and it's in C++
a good reference is here. start implementation now...!
Read this paper. It has pseudo code for the algorithm and some excellent background.
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I am currently trying to find out about ray casting in libgdx with bullet but there is 0 documentation that I find (Documentation I can interpret at least) The wiki Has nothing on the subject can anyone point me towards some info on the subject?
You should look at the Bullet documentation. The implementations in Java/LibGDX follow the same structures and rules as their C++ counterparts.
I can't give any specific links about ray casting as I've no experience with bullet. But any tutorials or documentation for the original should be very easily translatable to LibGDX.
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I have a set of linear equations that have an infinite number of solution (a solution set) but I cant seem to find any Java-libraries that can produce the solution-set (they all complain about the matrix being "Singular", which would produce an infinite set of solutions?).
I may be failing to understand something, but I've looked into some libs as JAMA and la4j but don't understand why they're not able to produce a solution-set for me.
BR Tomas A
EDIT: I've tried solving the set of equations using a "solver" online and it produces the solution-set for me so I know it should be possible.
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I am looking for something like jsfiddle but for java, so that code snippets and classes can be shared and tested.
At the moment, I am using a combination of pastebin and compileonline.com. I would rather not sign up for a huge online compiler service, just a quick and dirty code sharing/testing platform, that provides unique URL's for my code snippets.
I have seen other people asking similar questions:
https://stackoverflow.com/questions/15320286/is-there-online-compiler-for-java-like-jsfiddle
But there doesn't seem to be just the right tool. Anyone provide any pointers?
I tried using http://ideone.com/.
It supports a bunch of languages, including Java.
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I've been programming with Perl for a few years and consider myself proficient. I'm now trying to learn Java and am wondering what would be the best route / resource? Any recommendations on website and/or books would be appreciated. thx.
there are lots and lots of books; but one that i found really liking is Thinking in Java. Note that it's about Java the language, not (so much) about the libraries or environment.
Start with the Java Tutorial. http://download.oracle.com/javase/tutorial/
If you want a book, go for Head First Java.
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I am looking for a java port of this file,
Jenkins Hash in C
This looks like one.
Though, by the looks of description on the Wikipedia article you could port it yourself without too much trouble.
Hsieh's hash is even better. I don't know of a java implementation - i'm writing one right now.
At Github there is g414-hash project which includes hash functions you might want to use, including jenkins, murmur, hsieh and cwow. It also has bloom filter implementation for which hashes can be used.
A duck duck go searched reveals this: http://www.java2s.com/Code/Java/Development-Class/JenkinsHash.htm
Apache licensed - http://people.apache.org/~yonik/code/hash/Hash.html