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diff --git a/vendor/markbaker/complex/classes/src/functions/atan.php b/vendor/markbaker/complex/classes/src/functions/atan.php
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+<?php
+
+/**
+ *
+ * Function code for the complex atan() function
+ *
+ * @copyright Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
+ * @license https://opensource.org/licenses/MIT MIT
+ */
+namespace Complex;
+
+//include_once 'Math/Complex.php';
+//include_once 'Math/ComplexOp.php';
+
+/**
+ * Returns the inverse tangent of a complex number.
+ *
+ * @param Complex|mixed $complex Complex number or a numeric value.
+ * @return Complex The inverse tangent of the complex argument.
+ * @throws Exception If argument isn't a valid real or complex number.
+ * @throws \InvalidArgumentException If function would result in a division by zero
+ */
+if (!function_exists(__NAMESPACE__ . '\\atan')) {
+ function atan($complex): Complex
+ {
+ $complex = Complex::validateComplexArgument($complex);
+
+ if ($complex->isReal()) {
+ return new Complex(\atan($complex->getReal()));
+ }
+
+ $t1Value = new Complex(-1 * $complex->getImaginary(), $complex->getReal());
+ $uValue = new Complex(1, 0);
+
+ $d1Value = clone $uValue;
+ $d1Value = subtract($d1Value, $t1Value);
+ $d2Value = add($t1Value, $uValue);
+ $uResult = $d1Value->divideBy($d2Value);
+ $uResult = ln($uResult);
+
+ return new Complex(
+ (($uResult->getImaginary() == M_PI) ? -M_PI : $uResult->getImaginary()) * -0.5,
+ $uResult->getReal() * 0.5,
+ $complex->getSuffix()
+ );
+ }
+}