starfruit 0.3.1+2

A mathematical library extending and bettering provided dart and dart:math functions.

example/starfruit_example.dart

import 'package:starfruit/starfruit.dart';
import 'dart:core';

main () {
  //Begin math functions

  //Round to 2 decimal places
  //Ceiling and flooring to decimal places is also available
  print("Round 3.5634 to 2 decimal places:");
  print(mUtils.roundToDouble(3.5634, 2));
  print("");

  //Power of two check
  print("Is 8 a power of two?");
  print(mUtils.isPowerOfTwo(8));
  print("");

  //Calculate log base 2 of 8
  print("Calculate log base 2 of 8:");
  print(mUtils.log(2, 8));
  print("");

  //double isInteger check
  print("Is 6.0 an integer?");
  print(mUtils.isMathematicalInteger(6.0));
  print("");

  //Calculate 5!
  print("Calculate 5 factorial:");
  print(mUtils.factorial(5));
  print("");

  //Check if 2 is within 3 of 5
  print("Is 2 within 3 of 5?");
  print(mUtils.fuzzyEquals(2, 5, 3));
  print("");

  //Check if 7919 is a prime number
  print("Is 7919 prime?");
  print(mUtils.isPrime(7919));
  print("");

  //LCM of 2 and 7
  print("Calculate LCM of 2 and 7:");
  print(mUtils.lcm(2, 7));
  print("");

  //sinh of 1 radian
  print("Calculate sinh of 1 radian:");
  print(mUtils.sinh(1));
  print("");

  //mean of 3 and 7
  print("Calculate mean of 3 and 7:");
  print(mUtils.mean(3,7));
  print("");

  //nCr where n = 2 and r = 5
  print("Calculate the binomial coefficient of 2 and 5:");
  print(mUtils.combinationsOf(2, 5));
  print("");

  //nPr where n = 2 and r = 5
  print("Calculate the permutations of 2 and 5:");
  print(mUtils.permutationsOf(2, 5));
  print("");

  //end math functions

  //start collection functions

  //Separate List into chunks
  print("Separate List into chunks of 4:");
  print(cUtils.chunks([1,2,3,4,5,6,7,8], 4));
  print("");

  //Collapse List<List<Object>> into just List<Object>
  print("Collapse List<List> into List:");
  print(cUtils.collapse( [[1,2,3],[4,5,6,7,8]] ));
  print("");

  //Get every nth object of list
  print("Get every 4th object:");
  print(cUtils.nth([1,2,3,4,5,6,7,8], 4));
  print("");

  //Get every n random elements of list
  print("Get 5 random elements:");
  print(cUtils.random([1,2,3,4,5,6,7,8], 5));
  print("");

  //Flip keys and values of a map
  print("Flip keys and values of a map:");
  print(cUtils.flip({1:0, 2:8, 3:4, 0:5}));
  print("");

  //Zip two Lists into a map
  print("Zip two lists into a map:");
  print(cUtils.zip([1,2,3,4], [5,6,7,8]));
  print("");

  //Unzip a map into two lists
  print("Unzip a map into two lists:");
  print(cUtils.unzip({0:1, 8:2, 4:3, 5:0}));
  print("");

  //end collection functions

  //start stats functions
  var stats = StarStats([1,3,4,5,12,3,4,67,8,0,22]);

  //median
  print("Calculate the median:");
  print(stats.median);
  print("");

  //mean
  print("Calculate the mean:");
  print(stats.mean);
  print("");

  //mode
  print("Calculate the mode:");
  print(stats.mode);
  print("");

  //variance
  print('Calculate the variance:');
  print(stats.variance);
  print("");

  //standard deviation
  print("Calculate the standard deviation:");
  print(stats.stdDev);
  print("");

  //cardinality; number of unique elements
  print("Calculate the cardinality:");
  print(stats.cardinality);
  print("");

  //7 greatest elements
  print("Return the 7 greatest elements:");
  print(stats.topElements(7));
  print("");

  //end stats functions

  //start xy stats functions

  var xystats = StarStatsXY({2:3, 7:4, 4:6, 8:9, 1:2, 3:5, 11:14, 12:18});

  //Get correlation coefficient
  print("Calculate correlation coefficient:");
  print(xystats.corCoefficient);
  print("");

  //Get determination coefficent
  print("Calculate determination coefficient:");
  print(xystats.detCoefficient);
  print("");

  //Get adjusted determination coefficient
  print("Calculate adj. determination coefficient:");
  print(xystats.adjDetCoefficient);
  print("");

  //Get linear regression line
  print("Calculate linear regression line in form y = mx + b:");
  var lr = xystats.linReg;
  print("y = ${lr[0]}x + ${lr[1]}");
  print("");

  //Get quadratic regression line
  print("Calculate quadratic regression line in form y = ax^2 + bx + c:");
  var qdr = xystats.quadReg;
  print("y = ${qdr[0]}x^2 + ${qdr[1]}x + ${qdr[2]}");
  print("");

  //Get cubic regression line
  print("Calculate cubic regression line in form y = ax^3 + bx^2 + cx + d:");
  var cr = xystats.cubicReg;
  print("y = ${cr[0]}x^3 + ${cr[1]}x^2 + ${cr[2]}x + ${cr[3]}");
  print("");

  //Get quartic regression line
  print("Calculate quartic regression line in form y = ax^4 + bx^3 + cx^2 + dx + e:");
  var qrr = xystats.quarReg;
  print("y = ${qrr[0]}x^4 + ${qrr[1]}x^3 + ${qrr[2]}x^2 + ${qrr[3]}x + ${qrr[4]}");
  print("");
  // end xy stats functions

  //start linked list functions

  //giving numbers, but can take any object
  var llist = StarLinkedList( [12,5,6,1,4,6] );

  //Push object to front of list
  print("Push to front of list:");
  llist.push(8);
  print(llist);
  print("");

  //Add object to back of list
  print("Add to back of list:");
  llist.add(8);
  print(llist);
  print("");

  //Fetch 4th index (5th item) of list
  print("4th index:");
  print(llist[4]);
  print("");

  //Add two StarLinkedLists together
  print("Double llist:");
  print(llist+llist);
  print("");

  //Make 4th index 8
  print("Make 4th index 8:");
  llist[4] = 8;
  print(llist);
  print("");

  //Add 3 numbers
  print("Add 3 numbers:");
  print(llist.addAll([1,2,3]));
  print("");

  //Remove object from StarLinkedList given value
  print("Remove object from StarLinkedList given value:");
  llist.remove(12);
  print(llist);
  print("");

  //Delete object from StarLinkedList given index
  print("Delete object from StarLinkedList given index:");
  llist.delete(2);
  print(llist);
  print("");

  //Take sublist of StarLinkedList
  print("Take sublist of StarLinkedList:");
  print(llist.sublist(1,4));
  print("");
  //end linked list functions
}