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Akash Java Developer, India
$9 /hr
3 Years Exp.
0 Followers
I am a java developer having an experience of 3 year. I have worked on j2ee,spring,MVC,hibernate,spring boot,shiro (For security),MySql.....I am looki...Read More
I am a seasonal Java software developer with a vast knowledge of spring framework, vertx etc. I posse great dynamic in software development.
Ponraj D.Senior Java Programmer, India
$20 /hr
9 Years Exp.
0 Followers
I am developing java applications more than 9 years. And strongly known core java, spring, hibernate and database.
Manikandan Software Engineer, India
$1 /hr
4 Years Exp.
0 Followers
Java Developer having 4 years of experience in JAVA and Spring framework Highly skilled in building scalable applications
Anish Senior Software Developer, India
/hr
6 Years Exp.
0 Followers
OBJECTIVE I have 6 year of working experience as senior java Programmer TECHNICAL EXPERIENCE Java, Advance Java, Spring boot, Hibernate, Jpa,...Read More
Rajesh Java and Spring Deverloper, India
$20 /hr
12 Years Exp.
0 Followers
I am having experience of 12+ years on Java,J2ee, Angular and Spring technologies in various capacities. Had left my job and now into my own venture...Read More
Sai Krishna Software Engineer II, India
$15 /hr
3 Years Exp.
0 Followers
I am a software developer having 3+ years of experience predominantly in Java. I am good at problem solving with good computer science fundamentals.
Techcaresinc Java Software Engineer, Kenya
$100 /hr
0 Years Exp.
0 Followers
Techcares Inc - A Solution To Your Worries
Mehul Jariwala Senior Product Enginner, India
$8 /hr
1 Years Exp.
0 Followers
I am Mehul Jariwala Web Developer Welcome! I have experiences for 3+years in the field of Web Development , Web Designing,Responsive websites. I...Read More
Sanaullah Web Developer || Mobile Application Developer , Pakistan
$15 /hr
1 Years Exp.
0 Followers
I am a Software Engineer with love for JavaScript Technologies, A MERN Stack Developer with 1 year of experience in Node JS, Express JS, MongoDB and R...Read More
Vicky Software Developer, India
$1 /hr
3 Years Exp.
0 Followers
I am certified java Developer having 4 years experience
Hiren P.Senior Software Engineer, India
$10 /hr
4 Years Exp.
0 Followers
I am a Senior Java developer with 4+ years of work experience. I have experience about applications from various domains such as Health, Property, Me...Read More
Shashank Kumar Project Lead, India
$50 /hr
4 Years Exp.
0 Followers
I have extensive experience in Web Application development. In my entire career, I have worked on all Java related technologies, frameworks and tools...Read More
Nishath F.Java Software Developer, India
$3 /hr
2 Years Exp.
0 Followers
Clinical Management Software: - Client : Plexus Neuro and Stem Cell Research Center Domain : Health Care Technologies : Core Java (jdk1.6), Jsp, Sprin...Read More
Venkat Full stack developer , India
$12 /hr
8 Years Exp.
0 Followers
I am certified java developer having 8+ years of experience.
Prapulla Sravan Kumar Kona Senior Software Developer, India
$32 /hr
6 Years Exp.
0 Followers
I am a java developer having an experience of 6+ Years
Manoj Java Developer, India
$5 /hr
2 Years Exp.
0 Followers
I am java developer and I have 2+ year of experience in java technologies. Currently working as java developer in Infor. I have mostly work on core...Read More
Rushi Rushi Adhia, India
$15 /hr
5 Years Exp.
0 Followers
I am Programmer with 5+ years of experience Web Development. I am Special Expertise in wordpress and WHMCS development. I have created wide range of w...Read More
Marslin V.Full stack developer, India
$10 /hr
4 Years Exp.
0 Followers
3+ years of experience in developing web applications in Core Java, Spring MVC, Jsp, JSTL, JQuery, Javascript, AJAX, Json, Bootstrap, Sql server, Orac...Read More
Durgaprasad Software developer, India
$13 /hr
6 Years Exp.
0 Followers
I am a full stack developer having 6+ years of experience in both front end and back end technology. I have worked with various enterprise applicati...Read More
Rajinder Software Developer, India
$7 /hr
3 Years Exp.
0 Followers
I am a certified PHP and Java Developer having 2.9 years experience. Strong in design and integration problem-solving skills. Expert in Java, PHP wit...Read More
Amit G.softwere devloper, India
$5 /hr
4 Years Exp.
0 Followers
i am certified android developer with 4+ experience
Ram A.Software developer, India
$3 /hr
3 Years Exp.
0 Followers
I have 3 years of experience in hybrid mobile app development
Shivratan android develpment, India
$8 /hr
1 Years Exp.
0 Followers
i a certified android app developer i have team to work like android web desktop and etc. programming give a chance to work for you i make you sure t...Read More
Vijay R.Web Application Full-stack Developer, India
$14 /hr
9 Years Exp.
0 Followers
I'm a certified SCJP Developer, and has expertise in developing web applications using cutting edge technologies.
Electems Software Development, India
$13 /hr
8 Years Exp.
0 Followers
Our Company was founded in the year 2004 by a set of well know J2EE Architects. We are a team of 12 developers located at Bangalore, India and started...Read More
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Optimization deals with selecting the simplest option among a number of possible choices that are feasible or do not violate constraints. Python is used to optimize parameters in a model to best fit data, increase profitability of a possible engineering style, or meet another form of objective which will be described mathematically with variables and equations.

 

pyOpt is a Python-based package for formulating and solving nonlinear constrained optimization problems in an efficient, reusable and portable manner. Python programming uses object-oriented concepts, such as class inheritance and operator overloading, to maintain a distinct separation between the problem formulation and the optimization approach used to solve the problem.

 

All optimisation downside solvers inherit from the Optimizer abstract category. The category attributes include the solver name (name), an optimizer kind symbol (category), and dictionaries that contain the solver setup parameters (options) and message output settings (informs). The class provides ways to check and alter default solver parameters (getOption, setOption), as well as a method that runs the solver for a given optimisation problem (solve).

 

Optimization solver

A number of constrained optimization solvers are designed to solve the general nonlinear optimization problem.

  1. PSQP: This optimizer is a preconditioned sequential quadratic programming algorithm. This optimizer implements a sequential quadratic programming method with a BFGS variable metric update.
  2. SLSQP: This optimizer is a sequential least squares programming algorithm. SLSQP uses the Han–Powell quasi-Newton method with a BFGS update of the B-matrix and an L1-test function in the step-length algorithm. The optimizer uses a slightly modified version of Lawson and Hanson’s NNLS nonlinear least-squares solver.
  3. CONMIN: This optimizer implements the method of feasible directions. CONMIN solves the nonlinear programming problem by moving from one feasible point to an improved one by choosing at each iteration a feasible direction and step size that improves the objective function.
  4. COBYLA: It is an implementation of Powell’s nonlinear derivative–free constrained optimization that uses a linear approximation approach. The algorithm is a sequential trust–region algorithm that employs linear approximations to the objective and constraint functions.
  5. SOLVOPT: SOLVOPT is a modified version of Shor’s r–algorithm with space dilation to find a local minimum of nonlinear and non–smooth problems.
  6. KSOPT: This code reformulates the constrained problem into an unconstrained one using a composite Kreisselmeier–Steinhauser objective function to create an envelope of the objective function and set of constraints. The envelope function is then optimized using a sequential unconstrained minimization technique.
  7. NSGA2: This optimizer is a non-dominating sorting genetic algorithm that solves non-convex and non-smooth single and multiobjective optimization problems.
  8. ALGENCAN: It solves the general non-linear constrained optimization problem without resorting to the use of matrix manipulations. It uses instead an Augmented Lagrangian approach which is able to solve extremely large problems with moderate computer time.
  9. FILTERSD: It use of a Ritz values approach Linear Constraint Problem solver. Second derivatives and storage of an approximate reduced Hessian matrix is avoided using a limited memory spectral gradient approach based on Ritz values.

 

To solve an optimization problem with pyOpt an optimizer must be initialized. The initialization of one or more optimizers is independent of the initialization of any number of optimization problems. To initialize SLSQP, which is an open-source, sequential least squares programming algorithm that comes as part of the pyOpt package, use:

>>> slsqp = pyOpt.SLSQP()

This initializes an instance of SLSQP with the default options. The setOption method can be used to change any optimizer specific option, for example the internal output flag of SLSQP:

>>> slsqp.setOption('IPRINT', -1)

Now Schittkowski’s constrained problem can be solved using SLSQP and for example, pyOpt’s automatic finite difference for the gradients:

>>> [fstr, xstr, inform] = slsqp(opt_prob,sens_type='FD')

By default, the solution information of an optimizer is also stored in the specific optimization problem. To output solution to the screen one can use:

>>> print opt_prob.solution(0)

 

Example:

The problem is taken from the set of nonlinear programming examples by Hock and Schittkowski and it is defined as

=======================================================================

      min            − x1x2x3

     x1,x2,x3

 

subjected to     x1 + 2x2 + 2x3 − 72 ≤ 0

                        − x1 − 2x2 − 2x3 ≤ 0

 

                        0 ≤ x1 ≤ 42

                        0 ≤ x2 ≤ 42

                        0 ≤ x3 ≤ 42

 

The optimum of this problem is at (x1∗ , x2∗ , x3* ) = (24, 12, 12), with an objective function value of f ∗ = −3456, and constraint values g (x∗ ) = (0, −72).

 

#======================================================================

# Standard Python modules

#======================================================================

import os, sys, time

import pdb

#======================================================================

# Extension modules

#======================================================================

#from pyOpt import *

from pyOpt import Optimization

from pyOpt import PSQP

from pyOpt import SLSQP

from pyOpt import CONMIN

from pyOpt import COBYLA

from pyOpt import SOLVOPT

from pyOpt import KSOPT

from pyOpt import NSGA2

from pyOpt import ALGENCAN

from pyOpt import FILTERSD

 

#======================================================================

def objfunc(x):

   

    f = -x[0]*x[1]*x[2]

    g = [0.0]*2

    g[0] = x[0] + 2.*x[1] + 2.*x[2] - 72.0

    g[1] = -x[0] - 2.*x[1] - 2.*x[2]

   

    fail = 0

    return f,g, fail  

 

#======================================================================

# Instantiate Optimization Problem

opt_prob = Optimization('Hock and Schittkowski Constrained Problem',objfunc)

opt_prob.addVar('x1','c',lower=0.0,upper=42.0,value=10.0)

opt_prob.addVar('x2','c',lower=0.0,upper=42.0,value=10.0)

opt_prob.addVar('x3','c',lower=0.0,upper=42.0,value=10.0)

opt_prob.addObj('f')

opt_prob.addCon('g1','i')

opt_prob.addCon('g2','i')

print opt_prob

 

# Instantiate Optimizer (PSQP) & Solve Problem

psqp = PSQP()

psqp.setOption('IPRINT',0)

psqp(opt_prob,sens_type='FD')

print opt_prob.solution(0)

 

# Instantiate Optimizer (SLSQP) & Solve Problem

slsqp = SLSQP()

slsqp.setOption('IPRINT',-1)

slsqp(opt_prob,sens_type='FD')

print opt_prob.solution(1)

 

# Instantiate Optimizer (CONMIN) & Solve Problem

conmin = CONMIN()

conmin.setOption('IPRINT',0)

conmin(opt_prob,sens_type='CS')

print opt_prob.solution(2)

 

# Instantiate Optimizer (COBYLA) & Solve Problem

cobyla = COBYLA()

cobyla.setOption('IPRINT',0)

cobyla(opt_prob)

print opt_prob.solution(3)

 

# Instantiate Optimizer (SOLVOPT) & Solve Problem

solvopt = SOLVOPT()

solvopt.setOption('iprint',-1)

solvopt(opt_prob,sens_type='FD')

print opt_prob.solution(4)

 

# Instantiate Optimizer (KSOPT) & Solve Problem

ksopt = KSOPT()

ksopt.setOption('IPRINT',0)

ksopt(opt_prob,sens_type='FD')

print opt_prob.solution(5)

 

# Instantiate Optimizer (NSGA2) & Solve Problem

nsga2 = NSGA2()

nsga2.setOption('PrintOut',0)

nsga2(opt_prob)

print opt_prob.solution(6)

 

# Instantiate Optimizer (ALGENCAN) & Solve Problem

algencan = ALGENCAN()

algencan.setOption('iprint',0)

algencan(opt_prob)

print opt_prob.solution(7)

 

# Instantiate Optimizer (FILTERSD) & Solve Problem

filtersd = FILTERSD()

filtersd.setOption('iprint',0)

filtersd(opt_prob)

print opt_prob.solution(8)

 

Solving non-linear global optimization problems could be tedious task sometimes. If the problem is not that complex then general purpose solvers could work. However, as the complexity of problem increases, general purpose global optimizers start to take time. That is when need to create your problem specific fast and direct global optimizer’s need arises.

 

We have an specialized team with PHD holders and coders to design and develop customized global optimizers. If you need help with one, please feel free to send your queries to us.

 

We first understand the problem and data by visualizing it. After that we create a solution to your needs.

 

Please do read to understand what a solver is and how it works - If you want to create your own simple solver. This is not exactly how every solver works, however, this will give you a pretty solid idea of what is a solver and how it is supposed to work.

Over the last year or so, programming languages have regularly been prefixed with a curious word: modern, Modern Java. But what exactly does modern mean when used in this way?

 

When someone talks about modern languages, they're really just talking about how refined, how advanced and how convenient a programming language is. This also means that the language is capable enough not just to solve problems of the present, but of the future as well. A long line of features like scalability, being cloud-ready, and supporting newer paradigms and architectures is expected of a "modern" programming language.

 

Today, in fact, java is the most used runtime platform on enterprise systems (more than 97% of desktops). But more than that, its virtual machine powers packages and custom business applications, and a wide array of mobile and other embedded platforms.

 

Currently, according to Oracle, more than 3 billion devices run Java in some form. Most major companies use Java for some of their functions and Java server applications are processing tens of millions of requests each day.

 

Why java is so popular?

One of the most important reasons why Java is so popular is the platform independence. Java is a concurrent, class-based, and object-oriented programming language. It was initially designed to have as few implementation dependencies as possible, which lead to the term "write once, run anywhere" (WORA). This means that compiled Java code can run on all platforms with no need for recompiling the code.

 

Java-based applications are known for their speed and scalability. Its efficient processing speeds are used in software, computer games, and mobile Apps. Java supports Multithreading. Multithreading means handling more than one job at a time, so get more process get done in less time than it could with just one thread. Java is also a statically typed language, so that it brings a much greater degree of safety and stability to its programs compared to other popular languages. This safety and stability is a necessity for companies who require major bandwidth in their software and apps.

 

Is Java worth learning?

Java is still a relevant programming language that shows no sign of declining in popularity. Most developers choose it up as their initial programming language because it's reasonably simple to learn.

 

Since the language has an English-like syntax with minimum special characters, Java could be learned in a very short time span and used to build appropriate applications. It is part of a family of languages that are heavily influenced by C++ (as well as C#), thus learning Java offers vast benefits when learning these alternative two languages.

 

"Developing programs is a kind of making art, once you learn clearly and spend your time with full involvement; the creation of art became so easy and simple."

 

General Advantages of Using Java for Business Applications:

Programming with Java is incredibly common for banking and web applications. Compared to other programming languages, Java definitely stands out in terms of security functionality and environment. It comes with certain built-in security features such as:

 

Java apps are able to manage their own use by multiple users at the same time, creating threads for each use within the program itself, rather than having to run multiple copies of the programming in the same hardware. Each thread is tracked until the "work" is finished.

 

Java is so versatile and provides robust customized solutions for almost any type of business need. This "referred position" shows no signs of declining, especially now that Java 10 is on the horizon. It just keeps getting better.

 

Advanced Authentication and Access Control that allows incorporating a range of secure login mechanisms, along with creating the custom security policy and enforce a well-defined permission access policy to sensitive data.

 

Cryptography

Advanced Authentication and Access Control that allows incorporating a range of secure login mechanisms, along with creating the custom security policy and enforce a well-defined permission access policy to sensitive data.

 

Java apps are able to manage their own use by multiple users at the same time, creating threads for each use within the program itself, rather than having to run multiple copies of the programming in the same hardware. Each thread is tracked until the "work" is finished.

 

Java is so versatile and provides robust customized solutions for almost any type of business need. This "referred position" shows no signs of declining, especially now that Java 10 is on the horizon. It just keeps getting better.

 

 

Java is everywhere, in laptops, scientific supercomputers, gaming consoles, mobile phones, etc. Java is in all platforms and devices and in all countries around the world. It allows developers to make programs work just about anywhere. And it inspired the evolution of an incredible technology community. The brilliance of Java is that the platform independence. Java is simple to use, easy to write, compile, debug, and learn as compared to alternative programming languages. It also allows you to create reusable code and standard programs.

Java is a technology that constantly adapts to new needs these days, there’s a new release each six months or so. The most effective jobs go to Java developers who keep up with the constantly changing language and enhance their skill sets with complementary technologies.

Why Java developers are in demand?

Today, Java is the most popular choice for writing android apps. It’s also widely used in cloud applications, machine-learning environments, and internet of Things technology, Java developers need a wide range of skills, from a thorough information of the basics to an understanding of the latest developments. Java developers creates mobile apps, redesign the user experience on your public website, or keep business-critical applications on the cutting edge, everyone needs code; demand for Java developers is great. Banks and financial sector, automation systems, and other very big industrial sectors are writing their server apps for a long time in java and it will not even fade away soon.

Developing software takes time and planning. Before you start the development process, you’ll need to decide on the skills you need to induce your project off the ground. Most developers can have a grasp of the fundamentals associated with Java if it’s their primary programming language. However you'll be round-faced with those who’ll try and pass off theoretical information as practical experience.

There is a vast difference between the knowledge of a language and the practical application. Simply because a developer will explain a process doesn’t necessarily mean they can code a solution.

Hire a great java developer on Toogit

Hiring great coders or developers is one in all the toughest challenges. Toogit freelance platform provide easiest way to hire a top quality java developers just post your requirements on Toogit. Java Developers on Toogit are highly skilled and talented. Hiring Java Developers on Toogit is quite affordable as compared to a full-time employee and you can save up to 50% in business cost by hiring Java Developers on Toogit.

You are about to hire a Java Developer on Toogit but aren't sure if you have covered everything? I have gathered some important or effective recruiting strategy to hire new talent for your project.

  1. Write awesome job descriptions: Writing an excellent job description is a first step towards attracting top developers. A decent job description not only attracts candidates but the right candidates. Writing an excellent job description is not easy. And no, you simply cannot copy paste it from Google..! Writing your own and unique job description will effectively describe your project requirements and easily understandable for developers.
  2. Search top rank java developer: Toogit freelance platform have a large number of java developers, find high rated freelancers well experienced in project development and Good knowledge about latest technologies. A developer will usually list the versions they’ve used most recently on their CV, but if they don’t, bring up the topic in the interview if you want to know more. The most common version required as part of a tech stack is Java 8, the current LTS version of the language. This should be the primary focus when questioning a developer.
  3. Interview relevant candidates: The way you write job descriptions determines the standard of applications you receive. And, it’s the specific questions you ask in your interview process that helps you weed out the rest from the great ones. A quick interview will allow you to measure how strong every professional is in expressing concepts and explaining their method. The additional you speak to every professional by chat the better you’ll be able to gauge their expertness and communication skills and determine whether they’re right for your project.
  4. Decide the project cost and duration: It can be difficult for a client to understand the duration of a project and its cost, but a developer can sit down and discuss project scope, an inexpensive timeline, and any deliverables that you just will expect throughout the project’s development process.

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