Quasi Newton Optimization Algorithm in Java

I need to implement Quasi Newton Optimization Algorithm in Java, I�ve found it in C. Can anyone help me to find this in Java?

Plagiarise in British English. Plagiarize in American English.
These forums are used internationally, so either is reasonable.
Don't correct other people's spelling unless you're really sure of your ground.

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Data Structures and Algorithms in java book

Hi guys,
I want to know a good book which is good for Data Structures and Algorithms in java. I am good at Core java but a beginner for Data Structures in Java. I am a little poor in Data Structures concepts.
Following are the books I have found on the net. Could you help me the choose the best outta them.
1. Data Structures and Algorithms in Java - Mitchell Waite
2. Data Structures in Java - Sandra Anderson
3. Fundamentals of OOP and Data Structures in Java - Richard Weiner & Lewis J. Pinson
4. Object Oriented Data Structures Using Java - Nell Dale, Daniel T. Joyce, Chip Weems

lieni wrote:
I good data structures book doesn't have to be language-specific.Thx DrLazlo, my speachYes.
The OP wrote:
I have access to these books and dont know which one to start with.What I meant is that you shouldn't narrow your search to insist that the book you choose have "Java" in the title.

Classify and cluster documents with algorithm in java

Hello everybody,
I want to classify and cluster, let's say, 100 documents which are on the Intranet.
I was thinking of including an algorithm in java who can do this.
But i have no clue where to start of where to begin.
Please give me some advice or maybe an example ;),
Greetings,
Thijs Leusink
[email protected]

I was thinking of including an algorithm in java who
can do this.
But i have no clue where to start of where to begin.Two steps:
1. Find an algorithm that can do what you want.
2. Write it in Java.
Start with the first step: if you haven't done that yet, I don't think we can help you here. Possibly you could use Google to find an algorithm.
Then go on to the next step: if you don't even know how to begin writing a Java program then there is a collection of introductory tutorials here:
http://java.sun.com/docs/books/tutorial/
If you are having problems after that, come back here and ask a specific question.

Duplicating wincrypt algorithm in JAVA

Here is the background on this project: I am creating an automated licensing system for a company that sells telco products. Until now, they have been manually generating the activation keys using an exe program developed in house.
I have been hired to remove some of the manual interaction required from the employees, one of which is to automatically generate these activation keys. I emailed the developer of their exe about the algorithm he was using to generate the activation keys (based on serial number and hardware ID) because I need to duplicate that server-side. He said it probably wouldn't be possible because his program relies on wincrypt.
So my question is this: Is there any way at all to duplicate the wincrypt algorithm in JAVA? because i dont need that system to based on WINCRYPT, and using wincrypt.h will bound the user to have that file. I need to duplicate the wincrypt functionality exactly. Being off by even a little bit would render the script useless as it would generate invalid keys...
If anyone has any insight, I would love to hear it.
Sarwat
Edited by: Curgol on Jun 25, 2009 6:54 AM

Curgol wrote:
So you are saying that by using JCA/JCE i can have the same functionality that is being provided by wincrypt ?? i can implement the same encryption and decryption algorithm without being dependent on wincrypt.h and associated files ??
I know JCA/JCE packages provides encryption/decryption tools, but the problem is that i dont have any idea how wincrypt encrypt files, have it's cpp files though, but can the wincrypt functionality impolemented in JAVA ??.
Wincrypt from Microsoft is a library of hundreds of encryption related functions. The JCE defines an interface that providers provide implementations for. Just about everything in Wincrypt is available though one or more of the JCE providers.
There is no one encryption method provided by Wincrypt. If you are trying to match in Java an existing cryptographic process implemented using Wincrypt then you need to know exactly which of the Wincrypt algorithms (cipher, block mode, padding, key generation etc etc etc) is being used. Without this knowledge you are stuffed.

Different algorithms in Java

What are the different algorithms in Java? Can someone list me each and its uses?

Genetic Algorithm Method to Count Elephants:
Have lots of babies. Wait till they're sixteen and
throw them into Africa telling them to count
elephants. After 1 year, have a family reunion and
ask them to tell you how many they saw. Kill all the
ones that didn't count as many as some threshold.
Have the surviors have lots of kids, with each other.
Have them repeat the process. Keep it up and it'll
l converge to the right number, as long as they don't
die from a horrible genetic disease.
A. I don't think I can have babies. No uterus found. Pls advise.
B. Your fitness function doesn't guarantee that your babies are counting unique elephants. Its not much help if your kids count the same elephant 1 billion times.

Announce: Generic Algorithms for Java, 0.3 release

The latest release of jga: Generic Algorithms for Java is now available at
http://jga.sf.net/
Included in this release are a collection of algorithms adapted from STL that operate over generic collections and iterations. What's included are the algorithms that do not attempt to modify the collection/iteration that they're given: in other words, all of the find/search/count algorithms. Also included are the complete set of functors and predicates that were present in the last release, with a few modifications for easier use.
The library is released under the LGPL, and includes the source for the library, the test framework, and a non-genericized version of the test framework that verifies that the library may be used without having the generic environment available.

A (similar, it seems) parameterized collections library for JSR-14 Java.I had looked at JUtil some time ago, and I'm not sure of the similarity: JUtil looks to provide a number of interesting (if somewhat specialized) collections. JGA provides functors & predicates, and STL-ish algorithms that operate on collections and iterators. Looks to me to be more complimentary than similar.
Mr. Ananian/Astaire's site is also the source of SinjDoc, the javadoc tool that I used to generate the javadoc at jga.sf.net, and with which I replaced the munge4doc.pl and mungedoclist.pl scripts that I had previously used and posted on this forum.

El Gamal Algorithm and Java problem

I was trying to implement the El Gamal algorithm in java, but the problem is with the last part. I'm not getting the value of Message but according to algorithm i should get the value of message. Can anyone please tell me what did i do wrong?
theory says, msg = x * (z^a)modInverse(p);
import java.math.BigInteger;
import java.math.*;
import java.util.*;
class ElGamel
     public static void main(String[] args)
          BigInteger p = new BigInteger("7747");
          BigInteger q = new BigInteger("3853");
          BigInteger a = new BigInteger("773");
          BigInteger k = new BigInteger("1193");
          BigInteger msg = new BigInteger("39");
          BigInteger y = new BigInteger("0");
          BigInteger x = new BigInteger("0");
          BigInteger z = new BigInteger("0");
          BigInteger temp = new BigInteger("0");
          BigInteger t2 = new BigInteger("0");
          int t1 = 0;
          y = q.modPow(a,p);
          System.out.println("Y is "+y);
          x = q.modPow(k,p);
          System.out.println("X is "+x);
          t1 = k.intValue();
          z = (msg.multiply(y.pow(t1))).mod(p);
          System.out.println("Z is "+z);
          t1 = a.intValue();
          x = x.pow(t1);
          temp = x.modInverse(p);
          msg = z.multiply(temp);
          System.out.println("Message is "+msg);
}

Reposting your code with markup. In future please use [code] tags, as you can see the effect it has on legibility: import java.math.BigInteger;
import java.math.*;
import java.util.*;
class ElGamel
    public static void main(String[] args)
        BigInteger p = new BigInteger("7747");
        BigInteger q = new BigInteger("3853");
        BigInteger a = new BigInteger("773");
        BigInteger k = new BigInteger("1193");
        BigInteger msg = new BigInteger("39");
        BigInteger y = new BigInteger("0");
        BigInteger x = new BigInteger("0");
        BigInteger z = new BigInteger("0");
        BigInteger temp = new BigInteger("0");
        BigInteger t2 = new BigInteger("0");
        int t1 = 0;
        y = q.modPow(a,p);
        System.out.println("Y is "+y);
        x = q.modPow(k,p);
        System.out.println("X is "+x);
        t1 = k.intValue();
        z = (msg.multiply(y.pow(t1))).mod(p);
        System.out.println("Z is "+z);
        t1 = a.intValue();
        x = x.pow(t1);
        temp = x.modInverse(p);
        msg = z.multiply(temp);
        System.out.println("Message is "+msg);
}

Search Algorithm in Java

Hey Guys,
I have written a crude search algorithm which extracts 4 fields from a database table into the String type of Java. Then this String object is tokenized and then within these tokens I search for the text the user has used.
Once, I faced this problem that one of the String pulled from the DB was so huge that I got the OutOfMemory exception. Simple stating it, the text was so big that my system could not store all that text in one String object.
I resolved this by adding more heap to java by doing:
java -Xmx512M MySearchClass
Now I am afraid that if there is another HUGE text in the DB , I can still run out of memory.
Do I just need to get MORE RAM to my system and allot really huge heap space, such as 4 GB or so , so that if need be, the JVM can use it ?
Suppose I get a server machine with 4 GB RAM, at some stage I'd still have an upper limit on the amount of text I can extract from the DB, right ?
Is there any other way to stream the text from DB and then search ? Remember that I am tokenizing the text in the algorithm, so I think I can't use a buffer, or can I ?
thanks a ton !
-AZ

These are SQL queries. I use SQL queries to pull out the text in the DB and then store it in a String object. The problem is that the text in DB can get so huge that the String object cannot hold it anymore due to memory limits. The JVM gets assigned a heap size and the size of the String object can get really big to exceed the heap size.
I used : java -Xmx512M MySearchClass
That assigned 512MB to the JVM so I haven't encountered the OutOfMemory exception so far. But my guess is that for some other data set, the String can be so big that even 512MB might not be enough.
This search algorithm will be deployed on a server class machine with about 4 GB RAM. So we can give JVM 4GB heap space to use. But its a limitation again , right ?
These text in DB are extracted from PDF files.

Maintenance Optimizer - SMSY (ABAP + JAVA)

Hi gurus,
I will try to explain what is my doubt/problem.
We have a system ECC 6.0 with both stacks ABAP + JAVA. We want to do a support packages update, so I went to maintenance optimizer (MOPZ) and I choose that system, but during the process, after I select the SPS 18, in the end of MOPZ process, only ABAP packages (stack 18) were calculated! Which means the JAVA support packages was not maintained in Download Basket! Why?!
I would expect that process on MOPZ did this calculation for both stacks ABAP and JAVA together, but not, there is only ABAP packages in Download Basket!
Because I also want to do JAVA support packages Update (with JSPM)!
I guess this is a problem in SMSY... in Instance definition, isn't it?
Can you help me please?!
Thank you
João Dimas - Portugal

Hi,
The SMSY definition would be the problem.
Make sure the Java based techincal usage types are also selected for the system under the Product Instance Selection tab.
Also, a corresponding technical system should be created for the Java part. The technical system details should contain information about the Java stack i.e. message server, dispatcher port, software components etc.
Ideally all the above information should be populated automatically if the Java part of system is registered properly on the SolMan SLD and SMSY_SETUP has run successfully.
Regards,
Srikishan

JPG to JBIG Algorithm in JAVA

Hi!
I need to do the jpg to jbg compresion. (http://www.jpeg.org/jbig/)
This is a bi-level fax compresion. I don't find any solution for it...
I was looking at Markus Kuhn source code in c (http://www.cl.cam.ac.uk/~mgk25/jbigkit/), but I'm still in school and I don't have the knowledge to rewrite it into Java...
I need to make an applet for that conversation (i get a jpg picture), I'm trying with IMageMagick (http://www.yeo.id.au/jmagick/) and servlet right now (not pure programing solution ;))
Is there some other algorithms?? Perhaps in java (without native code)?
Thanks!

Take a look at the ImageIO stuff in java 1.4 and later.
This is a pluggable framework for loading and saving images. By default it can load and save jpeg and tiff (which has a
fax compression mode I believe).
If not then you can obtain thrid party plugins for the framework that support your format (or you can write your own).
If you wish to perform tasks such as colour conversion (convert the image to binary for example) then you may want to
look at JAI. However that is probably overkill. You can perform many simple image processing tasks using Java 2D.
matfud

Optimization library in Java?

I am wondering if there exit any Java classes that allow you to solve optimization problems (and more specifically, integer problems).
Anyone has an idea? thank you.

http://www.Opsresearch.com
Take a look there, they provide a jar which maybe will help you.
Another possibility would be to write it yourself, a good operations research book shows you many algorythms in sums and elementary mathematical expresions, so it isn't so difficult to implement them (i myself once have written a simplex algorythm, which e.g. can also be used to solve equation systems).
I don't think such classes will be default, since many new heuristic algorythms become developed, and e.g. there is no "computer" easy way to solve any type of differential equations (there are only methods for specific types), and often you have to change your finite-elements specific to your problem.
Especially numerical solvers is a huge area, and if u care of goodness of solutions, there is also no generic way. The one barrier function isn't so good for another problem.
Also some algorythms are still computation-power-expensive, so many people will abandon Java for such problems, even if the difference in performance isn't so big today (through JIT and even some native compilers). There some people even write routines in Assembler, because speed is essential (Traveling Salesman Problem - Class NP full, or how you call this in english, here heuristics like genetic algorythms are often used).

Standard Algorithms in Java

Hello everone,
does someone of you know a collection of standard algorithms programmed in Java where you can download the examples
(a kind of library or documentation)
We are trying to standardize our code (e.g. complex loops and conditions) and this would be a great help!
thanks a lot
Julian

hi,
sorry for the misty question.
I searched of the solution of quite common programming
problems .
meant to find something like that but it should be a little
bit more complex:
http://www.acknowledge.co.uk/snippets/java/docs/
thank you
Julian

Developing a Payroll System with NSD - A simpler algorithm in Java?

Hi,
I've been trying to develop a payroll system but I'm having some challenges on "trapping" the Night Shift Differential for all shifts.
I'm from the Philippines and our NSD starts from 10pm - 6am by law.
This payroll system is supposed to accept any shifts: day or night; 8-hour shifts, more or less than 8-hour shifts... making it dynamic in a sense.
I've tried to evaluate each possible shift by start time and end time against the NSD's start time and end time. The result is a lot of "if-else" statements and some deep nesting.
I'd like to know if there's a simpler algorithm for this in Java to "trap" the NSD from 10pm - 6am no matter what shift that "intersects" with it? Just so to have lesser complexity and better maintainability.
Thanks.

morphian wrote:
abillconsl wrote:
morphian wrote:
Not yet. I'm still working on the codes for computations.Where's the data? If it is not in a database, then where is it?I'm using test cases.Okay ... where was I going with my line of questioning? ... It is just this - if you know where your data is coming from and what form it is in, it can make a difference in how you proceed.
If you are working on Payroll data, nowdays it makes sense to imagine some relational DB containing the data. If that is the case, then knowing the structure of that data is absolutely paramount.
For example - I really can't imagine doing this with times of day. In a well conceived DB structure, employees would likely be assigned some employee classification, based on a coding structure of some kind ... NS, DS, FT, PT ... etc. This might be broken down further by other classifications such as Primary vs Secondary job, salaried vs hourly workers, earning codes, whatever.
So rather than working with times, you'd find the classifications of your employees and them perhaps add their hours or whatnot.
So you see, it makes all the difference.
~Bill

Looking for a simple example of the Minimax algorithm in java

Hey everyone,
I'm currently working on a Gameboy emulator program as a pet project, and for one of the game's I'd like for the enemy AI to use the Minimax algorithm, but I don't have any experience with it (or recursion in general, for that matter). Could anyone maybe post a simple example of how this algorithm works?

WTF? I'm sure you can find plenty of examples on google. It's on you to take the time to go through them, study them, and, if you still don't understand something, post a clear, concrete question that indicates what you read and what you didn't understand about it.
As is, you're essentially treating folks here as your research flunkies and saying, "Give me an example that's better than all the ones already easily available to me. Read my mind to know why I didn't like them."

Power load flow algorithms in Java

I have a project in hand,its about implementing power alorgithms using java,and i am very new to java programming.I need help in this area.Is there anyone who has the experience in writting tutorial packages(eg for electrical topics)?
thxk!

P=I*E;
Ummmm.... Pie

Quasi Newton Optimization Algorithm in Java

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