ml-distance
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Distance and similarity functions to compare vectors
17 lines • 482 B
JavaScript
/**
*Returns the Czekanowski similarity between vectors a and b
* @link [Czekanowski similarity](https://www.naun.org/main/NAUN/ijmmas/mmmas-49.pdf)
* @param a - first vector
* @param b - second vector
*
*/
export default function czekanowskiSimilarity(a, b) {
let up = 0;
let down = 0;
for (let i = 0; i < a.length; i++) {
up += Math.min(a[i], b[i]);
down += a[i] + b[i];
}
return (2 * up) / down;
}
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