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Moved weighted random into separate function.

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This commit is contained in:
Ajay Ramachandran
2019-07-16 22:51:17 -04:00
parent a4affb9e4d
commit 5c24a6109c
1 changed files with 47 additions and 34 deletions
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81
index.js
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@@ -218,41 +218,11 @@ function getVoteOrganisedSponsorTimes(sponsorTimes, votes, UUIDs) {
similarSponsorsGroups[i] = uniqueArray;
}
let finalSponsorTimeIndexes = [];
let weightedRandomIndexes = getWeightedRandom(similarSponsorsGroups, votes);
let finalSponsorTimeIndexes = weightedRandomIndexes.finalIndexes;
//the sponsor times either chosen to be added to finalSponsorTimeIndexes or chosen not to be added
let finalSponsorTimeIndexesDealtWith = [];
for (let i = 0; i < similarSponsorsGroups.length; i++) {
let sqrtVotesList = [];
let totalSqrtVotes = 0;
for (let j = 0; j < similarSponsorsGroups[i].length; j++) {
//multiplying by 10 makes around 13 votes the point where it the votes start not mattering as much (10 + 3)
//The 3 makes -2 the minimum votes before being ignored completely
//https://www.desmos.com/calculator/ljftxolg9j
//this can be changed if this system increases in popularity.
let sqrtVote = Math.sqrt((votes[similarSponsorsGroups[i][j]] + 3) * 10);
sqrtVotesList.push(sqrtVote)
totalSqrtVotes += sqrtVote;
//this index has now been deat with
finalSponsorTimeIndexesDealtWith.push(similarSponsorsGroups[i][j]);
}
let randomNumber = Math.random();
//this array will keep adding to this variable each time one sqrt vote has been dealt with
//this is the sum of all the sqrtVotes under this index
let currentVoteNumber = 0;
for (let j = 0; j < sqrtVotesList.length; j++) {
if (randomNumber > currentVoteNumber / totalSqrtVotes && randomNumber < (currentVoteNumber + sqrtVotesList[j]) / totalSqrtVotes) {
//this one was randomly generated
finalSponsorTimeIndexes.push(similarSponsorsGroups[i][j]);
break;
}
//add on to the count
currentVoteNumber += sqrtVotesList[j];
}
}
let finalSponsorTimeIndexesDealtWith = weightedRandomIndexes.indexesDealtWith;
//find the indexes never dealt with and add them
for (let i = 0; i < sponsorTimes.length; i++) {
@@ -277,4 +247,47 @@ function getVoteOrganisedSponsorTimes(sponsorTimes, votes, UUIDs) {
sponsorTimes: finalSponsorTimes,
UUIDs: finalUUIDs
};
}
function getWeightedRandom(indexes, weights) {
let finalIndexes = [];
//the indexes either chosen to be added to final indexes or chosen not to be added
let indexesDealtWith = [];
for (let i = 0; i < indexes.length; i++) {
let sqrtVotesList = [];
let totalSqrtVotes = 0;
for (let j = 0; j < indexes[i].length; j++) {
//multiplying by 10 makes around 13 votes the point where it the votes start not mattering as much (10 + 3)
//The 3 makes -2 the minimum votes before being ignored completely
//https://www.desmos.com/calculator/ljftxolg9j
//this can be changed if this system increases in popularity.
let sqrtVote = Math.sqrt((weights[indexes[i][j]] + 3) * 10);
sqrtVotesList.push(sqrtVote)
totalSqrtVotes += sqrtVote;
//this index has now been deat with
indexesDealtWith.push(indexes[i][j]);
}
let randomNumber = Math.random();
//this array will keep adding to this variable each time one sqrt vote has been dealt with
//this is the sum of all the sqrtVotes under this index
let currentVoteNumber = 0;
for (let j = 0; j < sqrtVotesList.length; j++) {
if (randomNumber > currentVoteNumber / totalSqrtVotes && randomNumber < (currentVoteNumber + sqrtVotesList[j]) / totalSqrtVotes) {
//this one was randomly generated
finalIndexes.push(indexes[i][j]);
break;
}
//add on to the count
currentVoteNumber += sqrtVotesList[j];
}
}
return {
finalIndexes: finalIndexes,
indexesDealtWith: indexesDealtWith
};
}