--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/www/includes/formulas.php Sun Aug 12 21:24:33 2018 +0200 @@ -0,0 +1,22 @@ +<?php + + +function ebc_to_srm($ebc) +{ + // Srm = -1.32303E-12*Ebc4-0.00000000291515*Ebc3+0.00000818515*Ebc2+0.372038*Ebc+0.596351 + return -1.32303E-12 * pow($ebc, 4) - 0.00000000291515 * pow($ebc, 3) + 0.00000818515 * pow($ebc, 2) + 0.372038 * $ebc + 0.596351; + // return $ebc * 0.508; +} + + +function srm_to_ebc($srm) +{ + // EBC = 0.000000000176506*Srm4+ 0.000000154529*Srm3-0.000159428*Srm2+2.68837*Srm-1.6004 + // + // Formule van Adrie Otten. brouwhulp. + $ebc = 0.000000000176506 * pow($srm, 4) + 0.000000154529 * pow($srm, 3) - 0.000159428 * pow($srm, 2) + 2.68837 * $srm - 1.6004; + return round($ebc); +} + + +?>