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Basic Characteristics RAPID

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ATan Calculates the arc tangent value<br />

Example<br />

ATan (Arc Tangent) is used to calculate the arc tangent value.<br />

VAR num angle;<br />

VAR num value;<br />

.<br />

.<br />

angle := ATan(value);<br />

Return value Data type: num<br />

Arguments<br />

Syntax<br />

The arc tangent value, expressed in degrees, range [-90, 90].<br />

ATan (Value)<br />

Value Data type: num<br />

The argument value.<br />

ATan’(’<br />

[Value ’:=’] <br />

’)’<br />

A function with a return value of the data type num.<br />

Related information<br />

Described in:<br />

Mathematical instructions and functions <strong>RAPID</strong> Summary - Mathematics<br />

Arc tangent with a return value in the<br />

range [-180, 180]<br />

Functions - ATan2<br />

<strong>RAPID</strong> Reference Manual 9-ATan-1

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