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<div class="backlinks"><a href="doc.html">TMBASIC Documentation</a> <wbr>► <a href="procedures_math.html">Procedures: Math</a></div><h1><span class="tt">Atan2</span> Procedure</h1>Returns the arc tangent of <span class="tt">y/x</span>, in radians.<div class="paragraphBreak"></div>Warning: The input numbers are internally converted to a less precise <a href="https://en.wikipedia.org/wiki/Double-precision_floating-point_format">64-bit binary floating-point</a> format.
The result is computed in this format and then converted back to TMBASIC's <a href="https://en.wikipedia.org/wiki/Decimal128_floating-point_format">128-bit decimal floating-point</a> format.
These conversions may cause a loss of precision.<div class="bar"><span>Declaration</span></div><div class="code"><div>function Atan2(</div><div><span class="indent">    </span>y as Number, x as Number</div><div>) as Number</div></div><h3>Parameters</h3><ul><li><i>y</i> as <a href="type_number.html">Number</a> — Numerator.</li><li><i>x</i> as <a href="type_number.html">Number</a> — Denominator.</li></ul><h3>Return value</h3><a href="type_number.html">Number</a> — The arc tangent of <span class="tt">y/x</span>.<h3>Example</h3><div class="bar"><span>Code</span></div><div class="code"><div>print Atan2(1, 0.25)</div></div><div class="bar"><span>Output</span></div><div class="code"><div>1.325817663668032553303532949939836</div></div>
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