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    <p>Have been trying to use the following code</p> <pre><code>&lt;?php define('FINANCIAL_MAX_ITERATIONS', 20); define('FINANCIAL_PRECISION', 1.0e-08); function RATE($nper, $pmt, $pv, $fv = 0.0, $type = 0, $guess = 0.1) { $rate = $guess; if (abs($rate) &lt; FINANCIAL_PRECISION) { $y = $pv * (1 + $nper * $rate) + $pmt * (1 + $rate * $type) * $nper + $fv; } else { $f = exp($nper * log(1 + $rate)); $y = $pv * $f + $pmt * (1 / $rate + $type) * ($f - 1) + $fv; } $y0 = $pv + $pmt * $nper + $fv; $y1 = $pv * $f + $pmt * (1 / $rate + $type) * ($f - 1) + $fv; // find root by secant method $i = $x0 = 0.0; $x1 = $rate; while ((abs($y0 - $y1) &gt; FINANCIAL_PRECISION) &amp;&amp; ($i &lt; FINANCIAL_MAX_ITERATIONS)) { $rate = ($y1 * $x0 - $y0 * $x1) / ($y1 - $y0); $x0 = $x1; $x1 = $rate; if (abs($rate) &lt; FINANCIAL_PRECISION) { $y = $pv * (1 + $nper * $rate) + $pmt * (1 + $rate * $type) * $nper + $fv; } else { $f = exp($nper * log(1 + $rate)); $y = $pv * $f + $pmt * (1 / $rate + $type) * ($f - 1) + $fv; } $y0 = $y1; $y1 = $y; ++$i; } return $rate; } // function RATE() $rate = RATE(120,-331.09,20000); print_r($rate); ?&gt; </code></pre> <p>very strange, if you put some values in as the monthly payment it works perfectly, but then when you put others in it does not work.</p> <p>the -331.09 does not work</p> <p>i am trying to work out why it would work for some but not all numbers, when on excel the same values work perfectly</p> <p>edit:</p> <p>the problem is the FINANCIAL_PRESICION which is defined at the top. for some numbers it works as 08, for others it needs 03 or 04, problem is, how to make it so it does that automatically as the right number?</p>
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