function variabilityOfAssociationProfiles($filename, $series, $keywordToTrack, $ap)
{
if (empty($series) || empty($keywordToTrack)) {
die('not enough data');
}
$filename = get_filename_for_export("hashtagVariability", "_variabilityOfAssociationProfiles", "gexf");
// group per slice
// per keyword
// get associated words (depth 1) per slice
// get frequency, degree, ap variation (calculated on cooc frequency), words in, words out, ap keywords
$degree = array();
foreach ($series as $time => $cw) {
$cw = $cw->getCowords();
foreach ($cw as $word => $cowords) {
foreach ($cowords as $coword => $frequency) {
// save how many time slices the word appears
$words[$word][$time] = 1;
$words[$coword][$time] = 1;
// keep track of degree per word per time slice
if (array_key_exists($word, $degree) === false) {
$degree[$word] = array();
}
if (array_key_exists($coword, $degree) === false) {
$degree[$coword] = array();
}
if (array_key_exists($time, $degree[$word]) === false) {
$degree[$word][$time] = 0;
}
if (array_key_exists($time, $degree[$coword]) === false) {
$degree[$coword][$time] = 0;
}
$degree[$word][$time]++;
$degree[$coword][$time]++;
}
}
}
// count nr of time slices the words appears in
foreach ($words as $word => $times) {
$documentsPerWords[$word] = count($times);
}
// calculate similarity and changes
foreach ($ap as $word => $times) {
$times_keys = array_keys($times);
for ($i = 1; $i < count($times_keys); $i++) {
$im1 = $i - 1;
$v1 = $times[$times_keys[$im1]];
$v2 = $times[$times_keys[$i]];
$cos_sim[$word][$times_keys[$i]] = cosineSimilarity($v1, $v2);
$change_out[$word][$times_keys[$i]] = change($v1, $v2);
$change_in[$word][$times_keys[$i]] = change($v2, $v1);
$stable[$word][$times_keys[$i]] = array_intersect(array_keys($v1), array_keys($v2));
}
}
// @todo, frequency
$out = "key\ttime\tdegree\tsimilarity\tassociational profile\tchange in\tchange out\tstable\n";
foreach ($ap as $word => $times) {
foreach ($times as $time => $profile) {
if (isset($change_in[$word][$time])) {
$inc = "";
foreach ($change_in[$word][$time] as $w => $c) {
$inc .= "{$w} ({$c}), ";
}
$inc = substr($inc, 0, -2);
} else {
$inc = "";
}
if (isset($change_out[$word][$time])) {
$outc = "";
foreach ($change_out[$word][$time] as $w => $c) {
$outc .= "{$w} ({$c}), ";
}
$outc = substr($outc, 0, -2);
} else {
$outc = "";
}
if (isset($stable[$word][$time])) {
$stablec = array();
foreach ($stable[$word][$time] as $w) {
$stablec[] = $w;
}
$stablec = implode(", ", $stablec);
} else {
$stablec = "";
}
$prof = "";
foreach ($profile as $w => $c) {
$prof .= "{$w} ({$c}), ";
}
$prof = substr($prof, 0, -2);
if (isset($degree[$word][$time])) {
$deg = $degree[$word][$time];
} else {
$deg = "";
}
if (isset($cos_sim[$word][$time])) {
$cs = $cos_sim[$word][$time];
} else {
$cs = "";
}
$out .= $word . "\t" . $time . "\t" . $deg . "\t" . $cs . "\t" . $prof . "\t" . $inc . "\t" . $outc . "\t" . $stablec . "\n";
}
}
file_put_contents($filename, chr(239) . chr(187) . chr(191) . $out);
echo '<fieldset class="if_parameters">';
echo '<legend>Your co-hashtag variability File</legend>';
echo '<p><a href="' . filename_to_url($filename) . '">' . $filename . '</a></p>';
echo '</fieldset>';
}
if ($_SERVER["REQUEST_METHOD"] == "POST") {
session_start();
if (empty($_POST["query"]) && !empty($_POST["new"])) {
//new document
setDocuments();
addNewDocument($_POST["new"]);
} else {
if (!empty($_POST["query"]) && empty($_POST["new"])) {
//calculate cosine sim
setDocuments();
cosineSimilarity($_POST["query"]);
} else {
if (empty($_POST["query"]) && !empty($_POST["new"])) {
//add new document and then calculate cosine
addNewDocument($_POST["new"]);
cosineSimilarity($_POST["query"]);
}
}
}
}
function cosineSimilarity($query)
{
$querySum = 0;
$termWeights = explode(" ", $query);
for ($i = 0; $i < count($termWeights); $i++) {
$querySum += pow($termWeights[$i], 2);
}
for ($i = 0; $i < count($_SESSION['documents']); $i++) {
$numerator = 0;
$documentSum = 0;
for ($j = 1; $j < 4; $j++) {
