Java Programming - Science topic

Mr Duodu, thank you.

Also, mr Amin, can I kindly ask you not to leave URL and ypur email after every comment of yours, its not professional, really.

Hereby attached is a system of three Ordinary Differential Equations (ODE). We have to use numerical methods such as RK4 and Euler to obtain the results using Java. I think RK4 is better for this kind of problem. In this thread, Dudley J Benton has already mentioned C programming for this. It is really amazing.

For the parameter values, you can use your own values for your convenience.

JCreator, BlueJ, NetBeans etc

Dear Agany Emmanuel

These links might be useful, have a look:

1. https://www.chegg.com/homework-help/questions-and-answers/urgent-implement-vector-quantization-gray-scale-image-using-java-programming-language-inpu-q89931831

2. https://github.com/sherifabdlnaby/Vector-Quantization-LBG-Image-Compression

3. https://is.muni.cz/th/kbhqh/thesis.pdf

4. https://www.geeksforgeeks.org/java-program-to-create-greyscale-image/

5. https://datacarpentry.org/image-processing/aio/index.html

Kind Regards

(1) Connecting building, building-integrated renewables and waste energy and mobility sectors. Think beyond e-cars, e.g. commercial micromobility docks, or even public transport on larger scale.

(2) Design commercial entities that are like ESCO-s for the carbon market. The upcoming ETS expansion will include buildings and mobility fuels, dig into how it works and come up with a model that can reap the benefits.

(3) Thermal smart grids, 5th generation district heating/cooling microgrids.

(3) Pogram energy communities, which can have a los of use-cases (For more info:

Intresting questions

I recommend the previous answer Kapila Asanga Dias but handwritten test cases can't really be replaced if you want to trust your suite of tests.

Especially if it is a small Java program, I'd recommend adding some handwritten tests using JUnit etc.

There is a difference between low-end and high-end applications development. Therefore, while numerous people would likely use a given language for simple applications at less demanding skill levels, larger companies may demand expert level knowledge. A job advert would make that very clear. There are many job advertising sites out there, many of which require sign-on privileges. Jobs are listed by category. IMHO that would be a most useful way to tackle your question.

Nowadays, It is rarely used of Java applets, an alternative for them is Java Servlet.

Servlets are placed into JAVAEE stack as an standard.

1) They do not provide in their API the same results as in Google Live.

2) The results are just an estimate of the total. If you navigate through the results pages you will see that for some queries there are actually less results than the number they show you.

3) Another point is that it is very difficult to compute NGD, you can check this thesis (chapter 4 (also 3)) as an alternative (method CBM): http://www.dbd.puc-rio.br/pergamum/tesesabertas/1012681_2014_completo.pdf

Sotiris Moschoyiannis

Thanks for the update Sotiris. Curious to see your results referring the application of XCS on a small system dynamics model. Cheers, Lukas

Dear Navdeep Kaur,

Look the link, maybe helpful.

Regards, Shafagat

Creating multiple applications to handle language and cultural variations would result in a maintenance nightmare. Your application future would have a very short horizon as success will demand more applications which require more maintenance which eats up your developer time leaving nothing for new features. The calculus is simple. All credible development environments will provide language independence and the ability to control page navigation based on a language key that you can read from your users web or device profile.

On the other hand, if you are considering a web application I would avoid a generic mobile development environment unless you plan to go beyond the 98% of the market held by Apple and Android. In discussing this with vendors of such systems, they universally have agreed that unless you are looking to support a range of platforms beyond just Apple and Android you'd be better of writing two applications. These systems were conceived to write applications to support Apple, Android, Blackberry, Windows Phone, Windows Universal, etc. The problem is that there are only two vendors left standing after the phone wars. The overhead of working in a generic solution saturated with "if apple then do this" and "if android then to this" will add about 50% to your code and still curtail your ability to take full advantage of the device. This is a reasonable compromise if you are supporting 5 targets, but not for just 2.

You might want to consider coding your application in either Android or Apple depending on your target market and then outsourcing the other. Outsourcing can have challenges, but this represents the simplest case. Given the Android/Apple code create the Apple/Android code to do the identical thing taking advantage of best practices for the second device. The core logic will be the same and it will be easy to QA.

Hi , Matlab provides built-in support for execution of Java methods,

instantiation of Java objects, access to fields, catching exceptions,

and more. Data type conversion of method parameters

passed from M to Java and of primitive types passed

from Java to M is done implicitly. Conversion of arrays and

strings passed from Java to M must be done explicitly by

means of conversion functions 

Good Luck 

1) EXAMPLE

movie x genre 

SELECT * WHERE {

?movie a <http://dbpedia.org/ontology/Film> .

?movie <http://dbpedia.org/ontology/genre> ?genre .

}

EXAMPLE

movie x genre for all italian movies:

SELECT * WHERE {

?movie a <http://dbpedia.org/ontology/Film> .

?movie <http://dbpedia.org/ontology/country> <http://it.dbpedia.org/resource/Italia> .

?movie <http://dbpedia.org/ontology/genre> ?genre .

}

2) In Java? A 2-dim. array of Genre objects?

I already read this paper sir, also gone through the API. but this API is for CP-ABE and i want to develop KP-ABE

Hi 

I think you can find more info if you follow this question

Also, this paper will give you some interesting information

Wannacry and ransomware attacks have made security first priority.

You can use goodle script as server for recieve data from matlab through Internet (eg HTTP request) and posting recieved data to google spreadsheet

for addind data from google script to table you can use code as:

var sheet = SpreadsheetApp.openById("FILE_ID"); //Открытие таблицы с ID

var n=sheet.getLastRow()+1; // last+1 row

var d = new Date(); // eg add current time

sheet.getRange("A"+n).setValue(d); // In (A,n) set d

OpenLDAP server has an abstraction layer for its database back end, allowing it to be replaced to handle not only different databses, but synthetic directory operations such as proxying, redirection, and filtering.   There are many available back ends, one of them is back-sql which, as the name implies, will translate LDAP queries into SQL so you can use MySQL or MSSQL to persist the directory.   Depending on the platform, and back end database, you will find how-tos on the web detailing how to build an OpenLDAP server fronting a SQL database.

-- Bob

I think it's a good idea, because as bloody beginner there is no benefit in learning most of the features of C++. In my opinion C is preferrable to C++ and Python is preferrable to C.

It is frustrating to learn things like pointers, references, headers, compiling stuff etc. and their sense theoretically without understanding in practice why we really need them.

Concluding, I think it makes more sense to get started with some simple and funny programming instead of hard work.

in your case looks like the variable is double, so you can use unique() instead of categories(), another way to do this is to convert the double array to a cell array of strings and then use categories() on it e.g.

a1=[1,2,3]'

unique(a1)

%%% OR

categories(categorical(cellstr(num2str(a1))))

Hi Yeshe,

I was looking for an offline software. If I'm not wrong, microsoft's software send calls to obtain the emotion data. The free version has limitations:

Images: 30K calls per month

Video (uploads): 300 per month

Video (query status): 3000 per month

But thanks for the help!

I think scala is fastest in distributed computations.

Thank you, Saimunur. 

Umple project can be useful (umple.org).

Umple is written by Umple which has UML as modeling elements and Java as an action language. You can use Umple itself to get what you need for your project.

Just as a notice: Umple supports what you mentioned as your project. It establishes a solid connection between code and Model. However, its philosophy is that there is no need to modify the code because Umple models can have both model and code at the same time. Therefore, developers can change their code even at the modeling level. 

Thank you so much . But I need the code of the paper 

Not enough info for a definitive answer.  So following may apply (or not).

If you are talking about "playing" the media on hardware that supports only 16 bit ints, then scaling, quantizing, etc., probably  won't work UNLESS you can "tell" the hardware that the data has been scaled/quantized (and HOW it has been), OR if it already expects the data to be scaled/quantized (in which case, you'd have to scale or quantize the way that the hardware expects...)

In general, it would seem to me (again, not knowing the actual specifics involved in this case) that the best you'll be able to do when converting float to int is to "round" - as an integer has no fractional part (unless the hardware accepts scaling of some sort).

Hi,

I'm not sure to fully understand your question, but it wonder if you are not mixing several concepts.

Indeed, unless a an application runs with root privileges, it cannot open or close a port itself. Ports can be opened or closed at the OS level, for instance using its firewall UI. In other words, MySQL (or any other app) doesn't need to run for its related ports being open or close. In fact, MySQL will not be able to run properly if the port(s) it uses are not open before it is launched. Thus, checking if ports are open or close will probably not be a solution for you. If I'm right (but again, I'm not sure to have fully understood your question), you need to check the traffic on the (open) ports. A right tool to do this is tcpdump. You'll find several examples around, for instance at http://superuser.com/questions/604998/monitor-tcp-traffic-on-specific-port

Hope this helps.

I suggest the MIT App Inventor for simple apps: http://www.appinventor.org/book2

I found the develpoment should fast. If you have knowledge of Java you can improve the emvironment with your own blocks.

You got an exception because something went wrong.  To avoid the exception, don't do that.

Please understand that there is no such thing as "an" exception.  Each exception has a detailed description, which includes a reference to the source line involved.

If you expect help, you have to ask a meaningful question.  This means that you WILL include all the details: the description of the exception, as displayed by the Java runtime,  the actual source line involved, ideally the values of all the variables participating in that line, and that's just in the hope somebody recognizes the conditions.  Better still, give us a snippet of code in a static main() that produces the same exception in a "one line" example (excluding the syntactic saccharine required for boilerplate or setting up the values used).  If not "one line", then the smallest example that exhibits the failure.

Without knowing what has been done to represent the multiprecision integer, and without any knowledge of what the exception was or the line of code that caused it, there is no way to suggest what might be wrong.  

How many bits do you need?  64? 256? 

Maybe you can help me.  A couple hours ago I got a syntax error from the compiler.  What did I do wrong?  How can I fix it?

Would it help if I told you that it was in a for-each construct on a subclass of a generic collection?

I spent fifteen years in one newsgroup and I found two to five questions per day that looked like yours.  I answered them the same way.

Dear Lokesh,

I suggset for you a links and attached files in topics.

-Comparison of K-Means and Fuzzy c-Means Algorithm Performance ...

https://www.ncbi.nlm.nih.gov › ... › PubMed Central (PMC)

- Comparative Study of Different Clustering Algorithms | Open Access ...

www.rroij.com/.../comparative-study-of-different-clusteringalgorit...

- ]A Comparison Study between Various Fuzzy Clustering Algorithms

Best regards

Hi Afaf

i think this will help you: JiST / SWANS

 

best regards,

ehsan

Here is a short tutorial: http://www.omp4j.org/tutorial

You can also read this thesis: https://is.cuni.cz/webapps/zzp/download/130155774

regards,

Bogdan

Once you have your Base64 encoded string audio file, you can decode it to a byte array using Base64 Java class as follows:

String content = new String(Files.readAllBytes(Paths.get("path_to_your_base64_encoded_audio")));

byte[] decoded = Base64.decode(content);

From now on your byte array stores all the required info to be played if you want so.

Dear Nishi Madaan,

You may use software bugs data of software Terapromise repository for your analysis. Here you can find different software log file in .csv format. 

Dear Eko Subha,

Look the link, may be useful.

Regards, Shafagat

It depends on the recommender system that you needs but  you can visits  eBOOK at boonbook for more informations

I am not sure if you can achieve this on Android using standard developement tools. I have some experience from game development and the solution is to take into account variable delay (dt). My colleagues tried to force Android to loops with fixed frequency, but unsuccessfully (same problem as yours). If you do not find solution with JAVA, you may try Android Native Development Kit (NDK) if it is still supported by Google. But expect lot of complications from significantly lower community support to deployment on Google Play.

Thank you very much. Your suggestions were very helpful.

Actually, I do not agree with Joachim's comment above - rule-based systems, including regexp-pattern-based ones, will ON THEIR OWN not be able to deliver a satisfactory performance. Reason is that language is too variable to be captured in these patterns (a lot of mateial will just not be matched) and adding patterns gets increasingly difficult since matching regions start to overlap and interact with each other. Do this only if you have only very little time and you want to show the general feasibility in the short term.

Much more promising is machine learning, as impressively demonstrated by IBM Watson's Jeopardy game in 2011. This system used some pattern based rules, but also a plethora of other signals, and was trained on correct question-answer pairs.

There is an open source implementation in java of a similar system called YodaQA, and I would recommend to take a look:

best, Chris

I could not get it..sorry...I was asking are these variants of PSO are same or different?

Thanks

you can check this link for more detail.

Hi, in https://pypi.python.org search the word2vec.

pip install word2vec

Hi ,

What is your use case exactly? could you please describe more while it differs widely?

Dear Researcher

please refer to these attachments if it is helpful for you.

Reagards

You will have to provide more information or a screenshot since there are several reasons that could cause such a problem (e.g. you may miss a JAR file from the imported library, or you have not imported the necessary object in java class file). However, a very good tutorial about Weka and Netbeans can be found on the link attached below.

It really is pretty hard (if not impossible) to give a 'one size fits all' answer.  The amount of training data you require is dependent on many different aspects of your experiment:

Hello !

One option to have very flexible development enviroment for robotics is using domain-specific modeling tool for specification of robot topology, joints and segment features, control logic and robot actions. Models can be directelly transformed to any target language. If you use soft SPS run-time system (PLC, IEC 61131-3) as "operating system for robot" then everything can be done easy. The only thing that should be programmed (if targer framework does not have it already) is algorithm for calculating rotations and elevations.In MainModel.jpg this algorithm is represented as function block "ArmAction", top right.

Some video examples are available in:

Dear Shashikant Ilager,

Look the link. May be useful.

Regards, Shafagat

1) Transform the image to GrayScale

2) Generate one image to each component color (R/G/B)

3) Transform the GrayScale image to binary

To transform RGB to GrayScale we need to use this expression:

Y = 0.3R + 0.59G + 0.11B;

And them, to convert the GrayScale to Binary

if (Y > 127) {b = 1; } else { b = 0; }

public static BufferedImage criaImagemCinza(BufferedImage imgJPEG) {

                // Create a new buffer to BYTE_GRAY

                BufferedImage img = newBufferedImage(imgJPEG.getWidth(), imgJPEG.getHeight(),BufferedImage.TYPE_BYTE_GRAY);

                WritableRaster raster = img.getRaster();

                WritableRaster rasterJPEG = imgJPEG.getRaster();

                // Foreach pixel we transofrm it to Gray Scale and put it on the same image

                for(int h=0;h<256;h++)

                        for(int w=0;w<256;w++) {

                                int[] p = new int[4];

                                rasterJPEG.getPixel(w, h, p);

                                p[0] = (int) (0.3 * p[0]);

                                p[1] = (int) (0.59 * p[1]);

                                p[2] = (int) (0.11 * p[2]);

                                int y = p[0] + p[1] + p[2];

                                raster.setSample(w,h,0,y);

                        }

                return img;

        }

Binary Image method, receive a Bufferedmage and convert it to Binary.

public static BufferedImage criaImagemBinaria(BufferedImage imgJPEG){

                // Create a new Binary Buffer

                BufferedImage img = newBufferedImage(imgJPEG.getWidth(), imgJPEG.getHeight(),BufferedImage.TYPE_BYTE_BINARY);

                WritableRaster raster = img.getRaster();

                WritableRaster rasterPB =criaImagemCinza(imgJPEG).getRaster();

                // Foreach pixel  check if the new one must be white or black

                for(int h=0;h<256;h++)

                        for(int w=0;w<256;w++) {

                                int[] p = new int[1];

                                rasterPB.getPixel(w, h, p);

                                if(p[0] > 127) {

                                        raster.setSample(w, h, 0, 1);

                                } else {

                                        raster.setSample(w, h, 0, 0);

                                }

                        }

                return img;

        }

RGB Image method, receive a Bufferedmage and a Type (0 - red, 1 - green, 2 - blue) and convert it to RGB Component that is used as parameter.

public static BufferedImage criaImagemRGB(BufferedImage imgJPEG, inttipo) {

                // Create a new RGB Buffer

                BufferedImage img = newBufferedImage(imgJPEG.getWidth(), imgJPEG.getHeight(),BufferedImage.TYPE_INT_RGB); 

                WritableRaster rasterT = img.getRaster();

                WritableRaster raster = imgJPEG.getRaster();

                // Foreach pixel just use the component that is passed as parameter.   

                for(int h=0;h<256;h++)

                        for(int w=0;w<256;w++) {

                                int[] p = new int[4];

                                raster.getPixel(w,h,p);

                                rasterT.setSample(w,h,tipo-1,p[tipo-1]);

                        }

                return img;

        }

Hi Emmanuel,

I did such thing before, as I've designed a mobile application for patient monitoring. I've used the following to achieve my system:

1- Java for android: this is for mobile app and will be used by patients to send their data.

2- PHP and MySQL database for back-end system, which is responsible for collecting data and visualise it, managing patients, search and alerts, adding new patients, writing notes and sending messages.

You will need to have a good skills and experiences in Java and PHP MySQL or you can use another web based environment. 

Kind regards

Ahmed

If your application is enterprise, the best way is to use general integration patterns like Web Services or Messaging. This way you can integrate PHP to Java, Python or every other programming language. Also you can decouple the implementations of front-end (PHP) & back-end (Java/Python) in a very clean manner.

There are a lot of Web Service (SOAP/REST) libraries or Messaging libraries for either PHP, Java, Python or other languages. You can find the best option which is proportionate for your application by searching in google.

Hi Vishal,

I played around with the example image that Kumarguru Poobalan posted since you mentioned it was comparable to your images - thanks Kumaguru! I ended up having great success opening the image with a channel operation of (red-255)*-1+green*2. This permitted a very simple recipe to find and separate the disease spots. I've attached a screen recording of MIPAR running through the recipe after the image was opened. The sequence was:

An Ostu-optimized global threshold to roughy identify the spots

A reject features step which eliminated false features under 100 pixels

Another reject features step which eliminated holes under 100 pixels

A smooth features step to reduce artificial spot roughness

A watershed step which separated artificially connected spots

The final visualization in the movie is just to show the separate features as different randomly assigned colors.

Please let me know what you think. The trick with an image like this I believe lies with a proper operation for the color to grayscale conversion - then the feature extraction is fairly straight forward. Even a "color segmentation" tool like those available in ImageJ or Photoshop are, I believe, essentially performing color-to-gray (i.e. vector-to-scalar) conversions behind these scenes. I'd be happy to make and send a similar recipe file for your images.

Cheers,

John

I didn't understand your question that much but as I understood I found this link you can look at it and tell me if that what are you looking for :)

I would add the following to Peter's answer. 

Historically, the "native" JVM (from Sun) is based on HostSpot just-in-time compilation.  Alternative JVM's could be found around, such as JRockit. It was known that  Hotspot JVM is better suited for UI desktop applications whereas JRockit is designed for best performance and fast executions.

Nowadays, Oracle is the owner of both Sun's JVM (HostSpot) and JRockit. The first one is shipped with the standard JRE, the latest is shipped with Oracle fusion. So, both are "native Oracle JVM's".  

Note that Oracle is merging the best of the two worlds since Java 8.

An interesting discussion on both implementations can be found at http://blog.dbi-services.com/a-comparison-of-java-virtual-machines-hotspot-jvm-vs-jrockit-jvm/

Hello with owl-api jar and PelletReasoner

first you import : org.semanticweb.owlapi.model.OWLDataProperty;

and uses this code

OWLOntologyManager manager = OWLManager.createOWLOntologyManager();

OWLOntology ontology = manager.loadOntologyFromOntologyDocument (new File (file));

// DataProperty

OWLDataProperty name = manager.getOWLDataFactory().getOWLDataProperty(IRI.create("URI_of your DataProperty "));

// Ind contains information about the individual (and all other individuals that were inferred to be the same)

OWLNamedIndividual ind = sameInd.getRepresentativeElement();

// get the info about this specific individual: dataProperty

Set<OWLLiteral> names = reasoner.getDataPropertyValues( ind, name );

  //  we can get the value directly

String nameInd = names.iterator().next().getLiteral();

I hope that is usful

I found the following tutorial:

I hope it helps.

All the best.

Check this..

It give an detailed outline/steps required to Create a MVC project using maven and struts2 in eclipse IDE..

very helpful for beginners..

you can use openssl as a  shell command  c code and store the the key file

Another one  https://github.com/KarloKnezevic/ANFIS

Jython

Khalid,

This is the approach taken by Jacobson for conceptual class stereotypes in OOA in the Unified Process, which you may or may not want to use. See the "Unified Software Development Process" book for all the detail. Summaries can be found online. Jacobson recommends using use cases to find the different types of conceptual class, e.g.  one boundary class per use case.

Best regards,

import java.lang.instrument.Instrumentation;

public class ObjectSizeFetcher {

private static Instrumentation instrumentation;

public static void premain(String args, Instrumentation inst) {

instrumentation = inst;

}

public static long getObjectSize(Object o) {

return instrumentation.getObjectSize(o);

}

}

public class C {

private int x;

private int y;

public static void main(String [] args) {

System.out.println(ObjectSizeFetcher.getObjectSize(new C()));

}

}

It is enough for most cases to use jconsole tool from JDK  bin directory.

There is a "contract" that objects being equals() -> true must have the same hash code value. However two objects having the same hash code value are not obligatorily equals() -> true. Default implementations of equals() and hashCsode() compares memory adresses not field values of your object and that is what you want if you Let's say you override equals() by using fields of your object a business model object. If equals() is overridden in a manner that it checks object fields for equality but hashCode() still has the default implementation youmight face trouble storing and retreivig objects in a HashMap. Let's say you put a Person in a HashMap. The name variable's value is "John". If you look for a person named John in your HashMap it will look for the hash value first. If the value is not found it returns a NULL value hence it doesen't work correctly. If you override both method the shoulb be overridden correctly. If your hashCode() alsways returns an int=9 it is worth nothing.

Hi Zakaria,

Depending on what kind of optimisation you want:

-1- mono-objective: if you want to optimise a trade-off (a compromise ) of all the objectives, then, you can use a linear solver (e.g. (commercial) CPLEX , (free) COIN-OR / GLPK ) with a weighted-sum objective (i.e. w1*obj1 + w2*obj2 + w3*obj3 | wi>0 and w1+w2+w3=1).

=> The expected result here is a unique solution.

-2- multi-objective: you optimise each objective "separately". There are many techniques which transform the multi-objective problem into several mono-objective problems that you have to solve one after the other (e.g. epsilon-Constraint, Aneja&Nair (two steps method))

=> The expected result here is a set of non-dominated solutions (each solution is better than the others on a least one objective).

I hope that this gonna help you to decide where your problem fits most and what tools/technique to use.

Takfarinas.

Safeeullah, what is the source of visualisation you have? Do you want to develop code and visualise it during the development (see answer of Chad Frederick). Or do you have written code bases that you want visualise?

What format are they in? Do you have a snapshot? Do you have a whole history (e.g., in form of a repository [git, svn, ...] including all logs)?

Just one thought : Java was created in order to make applets/apps portable. A java application is therefore supposed to be "independent" from the hardware (beside the fact that the JVM is obviously compiled for a given architecture, but the API remains the same across architectures). You can use/call native code through the JNI interface, but this makes often your app non portable.

Beside this, I agree with Thomas. I personally wrote several traffic assignment algorithms on very large networks using parallel threads in Java. I agree that before 2002/2003 this would not have been possible, but modern JVM/HotSpot has comparable performances to C++.

This being said, did you have a look to Apache Common Math ? http://commons.apache.org/proper/commons-math/

This library is well written and supported...

Thanks Aleksandar, yes this is on my mind a lot. I looked at OpenCV but not in depth and thought this was more image processing again like the Marvin project I looked at, but will look at this again in more depth now.

And yes, when I was doing my Foundation Degree we drew objects using pixel points. I think my mind is starting to think the right way but all words of advice and information helps me think much more. Thankyou for this.

Do you want to do this in some specified way? E.g. with annotations or something like that? Otherwise, you could use bitmasks I guess.

It depends on what you mean by that. If it is just a function written in Fortran that you want to call Sina's approach will work. Most people would try to call the function directly. In Java you would need JNI for this task. Python has something similar. You can find how to call C functions in general. Then look in the manual of your Fortran compiler to figure out the final function name which is then C-compatible.

If, however, you have an entire program written in Fortran that you used to call from the command line you should keep it as a separate program. Use the exact same command line with Popen in Python, for example. I would guess that Java also has something similar.