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new_calculate_historical_AV_BC.php
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new_calculate_historical_AV_BC.php
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<?php
foreach (new DirectoryIterator('elections') as $fileInfo) {
if($fileInfo->isDot()) {
continue;
} else {
$fn = 'elections/'.$fileInfo->getFilename();
$elec_data = json_decode(file_get_contents($fn),1);
$seats = $elec_data['ELECTION']['seats'];
$year = $elec_data['ELECTION']['id'];
$ballots = file2data($fn);
//$candidates = count($elec_data['CANDIDATES']);
//APPROVAL
/*
$approv = findApproval($ballots,$seats);
$out = '';
foreach ($approv as $eid => $tally) {
$out .= $eid.",".$tally."\n";
}
$outfile = 'historical_approval/approval_'.$year.'.csv';
file_put_contents($outfile,$out);
*/
//BORDA
$borda = findBorda($ballots,$seats);
$out = '';
foreach ($borda as $eid => $tally) {
$out .= $eid.",".$tally."\n";
}
$outfile = 'new_historical_borda/borda_'.$year.'.csv';
file_put_contents($outfile,$out);
}
}
function findBorda($ballots,$seats) {
$cand_list = getCandidates($ballots);
$cand_num = count($cand_list);
$tallies = array();
foreach ($ballots as $ballot) {
foreach (range(0,$cand_num-1) as $num) {
if (isset($ballot[$num])) {
$cname = $ballot[$num];
if (!isset($tallies[$cname])) {
$tallies[$cname] = 0;
}
$tallies[$cname] += $cand_num - $num;
}
}
}
$slate = array();
unset($tallies['-']);
return getSlate($tallies,$slate,$seats);
}
function getCandidates($ballots) {
$cands = array();
foreach($ballots as $ballot) {
foreach($ballot as $cand) {
$cands[$cand] = 1;
}
}
$candidates = array_keys($cands);
natsort($candidates);
return array_values($candidates);
}
function file2data($filename) {
$data = json_decode(file_get_contents($filename),1);
$ballots = $data['BALLOTS'];
$lengths = array();
foreach ($ballots as $bal) {
$lengths[] = count($bal);
}
$stdlength = max($lengths);
$new_ballots = array();
foreach ($ballots as $bal) {
$need = $stdlength - count($bal);
if ($need) {
$a = array_fill(count($bal),$need,'-');
$new_ballot = array_merge($bal,$a);
$new_ballots[] = $new_ballot;
} else {
$new_ballots[] = $bal;
}
}
return $new_ballots;
}
function findApproval($data,$seats) {
$cands = $data[0];
natsort($cands);
$tallies = array();
foreach ($data as $ballot) {
foreach (range(0,$seats-1) as $num) {
if (isset($ballot[$num])) {
$cname = $ballot[$num];
if (!isset($tallies[$cname])) {
$tallies[$cname] = 0;
}
$tallies[$cname] += 1;
}
}
}
$slate = array();
unset($tallies['-']);
return getSlate($tallies,$slate,$seats);
}
function getSlate($tallies,$slate,$seats) {
if (count($slate) >= $seats) {
return $slate;
}
/*
if (count($slate) > $seats) {
print "PROBLEM: slate is too big\n";
exit;
}
*/
arsort($tallies);
$highest = max($tallies);
$winners = array();
$current_top_set = array();
foreach ($tallies as $cand => $score) {
if ($highest == $score) {
$current_top_set[] = $cand;
}
}
if (count($slate) + count($current_top_set) > $seats) {
$num_needed = $seats - count($slate);
//shuffle($current_top_set);
//$to_add = array_slice($current_top_set,0,$num_needed);
$percentage = round(100*($num_needed/count($current_top_set)),5);
foreach ($current_top_set as $chosen) {
$slate[$chosen] = $percentage;
unset($tallies[$chosen]);
}
} else {
foreach ($current_top_set as $chosen) {
$slate[$chosen] = 100;
unset($tallies[$chosen]);
}
}
return getSlate($tallies,$slate,$seats);
}