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I'd like to set up a large linear programming model to solve an interesting problem. I would be most comfortable in Java. What tools/libraries are available?
There were several suggestions from an earlier question that I posted:
CPLEX
Dash
OptimJ
COIN-OR
lp_solve
and possibly more...
I used lp_solve with success. It looks like there is a native Java API, but I've only used the text file interface. It supports the semi-standard MPS and LP file formats, which I found more convenient for trying out different solvers (such as glpsol).
Currently, google digs up this Java Linear Programming libs:
http://scpsolver.org/
http://javailp.sourceforge.net/
http://www.joptimizer.com/linearProgramming.html
http://www.win-vector.com/blog/2012/11/yet-another-java-linear-programming-library/
http://commons.apache.org/math/userguide/optimization.html
http://ojalgo.org/
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I'm doing a big machine learning project in Java.
I tried some libraries but they were uncomfortable. Not many algorithms, few examples, unclear function parameters.
So, I wanted to ask if anyone knew a convenient library in Java for machine learning. (In terms of: easy to import, easy to use, lots of samples, etc.)
In addition, I have already read the csv file to a matrix. So if the library uses it, it will be better. Thank you.
Here are a few links
ApacheSAMOA: https://samoa.incubator.apache.org/
Weka: http://www.cs.waikato.ac.nz/ml/weka/
Rapid Miner: https://rapidminer.com/
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I've been looking for a way to plot complex numbers on the unit circle in Java like this
But I haven't found any. I'd like to ask if you have some idea about library which could be used, or any other way. Thank you.
Just look at this. This is a part of this project.
This class generates following:
Make sure to google first:
How do I plot 2 points in a graph in a GUI?
How to create Java GUI program for complex mathematical equations
or read the java tutorial:
https://docs.oracle.com/javase/tutorial/2d/
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I know you can use pHash from .NET or Java, but I would like a pure .NET (preferably) or Java implementation. Are there any others available? I am interested in the image hashing functionality specifically.
A perceptual hash is a way of creating a numeric hash of images and then being able to compare those hashs to see if the images are similar. It allows for really fast image recognition.
Here is an Java implementation of pHash for images by Elliot Shepherd.
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One of my favorite features in Python (I know it's not really a feature of python) is doc-testing. For me it really augments standard documentation and helps to keep it up to data. Looking for something similar in Java, I've found JDocTest - http://cscott.net/Projects/JDoctest/ - last updated two years ago, and doctestj http://code.google.com/p/doctestj/ which haven't been updated since 2007.
Obviously, Java is not interpreter based like Python, but maybe there's some up to date library that enables doctest like capability in java?
I know it's long time ago but I just found your post here while searching for something different.
In my company we built a java doctest library because we also like the idea of the python doctests. We're using it in one of our bigger projects to test and generate documentation with it.
You can find it here at Github
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there is a matrix library for java available http://math.nist.gov/javanumerics/jama/ is there anything similar in groovy?
You can easily use Java libraries inside Groovy code, just import and use. In addition, with a low effort, you could write your own DSL to wrap the JaMa library (and release it of course :)
you could have a look at the GroovyLab or Groovy-Matrix projects covering classes for Groovy math engineering:
http://code.google.com/p/groovylab/
http://code.google.com/p/groovy-matrix/
both projects seem a bit outdated, but it should certainly be not a big problem to push them to the latest Groovy version.