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  54 <h5 class="subsubsection">3.1.4.2 Unary forms</h5>
  55
  56 <p>Unary or one-operand forms
  57 <a name="index-unary-form-238"></a><a name="index-one_002doperand-form-239"></a>are summarized in the following table, where <code>X</code>
  58 stands for the operand.
  59    <p><table summary=""><tr align="left"><th valign="top">Op         </th><th valign="top">Operand
  60  </th><th valign="top">Result </th><th valign="top">Description
  61 <br></th></tr><tr align="left"><td valign="top"><code>-X</code>      </td><td valign="top">scalar
  62 <a name="index-_002d_0040r_007b_002c-unary-minus-operator_007d-240"></a> </td><td valign="top">scalar </td><td valign="top">Unary scalar negation.
  63 <br></td></tr><tr align="left"><td valign="top"><code>-X</code>      </td><td valign="top">vector
  64  </td><td valign="top">vector </td><td valign="top">Unary vector negation.
  65 <br></td></tr><tr align="left"><td valign="top"><code>|X|</code>     </td><td valign="top">vector
  66  <a name="index-_007c_0040math_007bX_007d_007c_0040r_007b_002c-magnitude-operator_007d-241"></a> </td><td valign="top">scalar </td><td valign="top">Vector length.
  67 <br></td></tr><tr align="left"><td valign="top"><code>unit(X)</code> </td><td valign="top">vector
  68  <a name="index-unit-242"></a> </td><td valign="top">vector </td><td valign="top">Unit vector with same direction.
  69 <br></td></tr><tr align="left"><td valign="top"><code>sqrt(X)</code> </td><td valign="top">scalar
  70  <a name="index-sqrt-243"></a> </td><td valign="top">scalar </td><td valign="top">Scalar square root.
  71 <br></td></tr><tr align="left"><td valign="top"><code>sin(X)</code> </td><td valign="top">scalar
  72  <a name="index-sin-244"></a> </td><td valign="top">scalar </td><td valign="top">Trigonometric sine (<code>X</code> in degrees).
  73 <br></td></tr><tr align="left"><td valign="top"><code>cos(X)</code> </td><td valign="top">scalar
  74  <a name="index-cos-245"></a> </td><td valign="top">scalar </td><td valign="top">Trigonometric cosine (<code>X</code> in degrees).
  75 <br></td></tr><tr align="left"><td valign="top"><code>atan2(X,Y)</code> </td><td valign="top">scalar
  76  <a name="index-atan2-246"></a> </td><td valign="top">scalar </td><td valign="top">Polar angle in degrees of vector [X,Y].
  77 <br></td></tr><tr align="left"><td valign="top"><code>inverse(X)</code> </td><td valign="top">transform
  78  <a name="index-inverse-247"></a> </td><td valign="top">transform </td><td valign="top">Inverse transform.
  79    <br></td></tr></table>
  80    <pre class="sp">
  81
  82 </pre>
  83 Errors are reported when <code>|X|</code>, <code>unit</code>, <code>sqrt</code>,
  84 <code>atan2</code>, and <code>inverse</code> fail due to bad parameters.
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