de 1.0.3

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A Library for Differential Evolution Optimization

Created by Matletik - Mathematical Manipulatives and Interactive Learning Tools

http://www.matletik.com

Usage #

A simple usage example:

import 'package:de/de.dart';

double f(List<double> x) {
  return -(pow(x[0] - 3.14159265, 2.0) + pow(x[1] - exp(1.0), 2.0));
}

void main(){
  DE de = DE(f, [-500, -500], [500, 500], cr: 0.99, F: 1.20, popsize: 300);
  de.iterateN(5000);
  Solution best = de.getBest();
  print(best);
}

Details #

  • The objective function is always in the form of
double f(List<double> x){

}
  • The optimization is always a maximation. If the objective function of the problem is a minimization, the returned value of the objective function can be multiplied by -1.0.

  • The default parameters of the classical Differential Evolution Optimization are set to cr = 0.8 and F = 1.0. These optimization parameters can be customized in the constructor of DE class.

1.0.3 #

  • README.md changed.
  • Reduced warnings due to Dart Analysis
  • Code reformatted.

1.0.2 #

  • Description changed.

1.0.1 #

  • Description changed.

1.0.0 #

  • Initial version, created by Matletik.

example/de_example.dart

import 'package:de/de.dart';
import 'package:de/src/Solution.dart';

void main() {
  List<double> vals = [
    1.0,
    2.0,
    3.0,
    4.0,
    5.0,
    6.0,
    700.0,
    800.0,
    900.0,
    100.0
  ];
  double f(List<double> x) {
    double s = 0.0;
    for (int i = 0; i < vals.length; i++) {
      s += (vals[i] - x[0]).abs().toDouble();
    }
    return -s;
  }

  DE de = DE(f, [-100.0], [100.0], cr: 0.99, F: 1.50, popsize: 300);
  de.iterateN(10000);
  de.calculateFitnessForAll();
  Solution best = de.getBest();

  print(best);
}

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  de: ^1.0.3

2. Install it

You can install packages from the command line:

with pub:


$ pub get

with Flutter:


$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:de/de.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
0
Health:
Code health derived from static analysis. [more]
99
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
95
Overall:
Weighted score of the above. [more]
49
Learn more about scoring.

We analyzed this package on Mar 30, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.6

Health issues and suggestions

Document public APIs. (-1 points)

15 out of 15 API elements have no dartdoc comment.Providing good documentation for libraries, classes, functions, and other API elements improves code readability and helps developers find and use your API.

Maintenance suggestions

Homepage URL is insecure. (-5 points)

Update the homepage field and use a secure (https) URL.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0 <3.0.0
pso ^1.0.1 1.0.2
Dev dependencies
pedantic ^1.8.0
test ^1.6.0