<?php
function similarity($w1,$w2) {
//return cosine similarity of w1 and w2 using formula in the
//definition here: http://en.wikipedia.org/wiki/Cosine_similarity
//get numerator:
$numerator = 0;
for($i = 0, $l = count($w1); $i < $l; $i++) $numerator += $w1[$i]*$w2[$i];
//get abs(w1) and abs(w2)
$abs_w1 = 0; $abs_w2 = 0;
for($i = 0, $l = count($w1); $i < $l; $i++) {
$abs_w1 += $w1[$i]*$w1[$i];
$abs_w2 += $w2[$i]*$w2[$i];
}
$abs_w1 = sqrt($abs_w1);
$abs_w2 = sqrt($abs_w2);
//make denominator:
$denominator = $abs_w1*$abs_w2;
return $numerator/$denominator;
}
echo similarity([1,99,999
,4,5,6,7,8,9],[1,2,3,4,5,6,7,8,88]);
- Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
- 0.046675964363368
- Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
- Parse error: syntax error, unexpected '[', expecting ')' in /in/Fa1hV on line 25
Process exited with code 255. - Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
- Parse error: parse error, unexpected '[', expecting ')' in /in/Fa1hV on line 25
Process exited with code 255. - Output for 4.3.2 - 4.3.4
- Parse error: parse error, expecting `')'' in /in/Fa1hV on line 25
Process exited with code 255.
preferences:
201.76 ms | 401 KiB | 306 Q