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<?php function calculateAccuracy($txPower, $rssi){ if ($rssi == 0) { return -1.0; // if we cannot determine accuracy, return -1. } $ratio = $rssi*1.0/$txPower; if ($ratio < 1.0) { return pow($ratio,10); } else { $accuracy = (0.89976)*pow($ratio,7.7095) + 0.111; return $accuracy; } } echo(calculateAccuracy(-100, -70)); echo(calculateAccuracy(-120, -70)); echo(calculateAccuracy(-140, -70)); echo(calculateAccuracy(-160, -70)); echo(calculateAccuracy(-180, -70)); echo(calculateAccuracy(-200, -70)); echo(calculateAccuracy(-220, -70));
Output for git.master, git.master_jit, rfc.property-hooks
0.02824752490.00456213297416990.00097656250.000256909742347497.9114365451574E-52.7585473535156E-51.0635394207215E-5

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