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Su, Xiaomeng
76a5b1ee83
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Su, Xiaomeng <suxiaomeng1@huawei.com> Co-committed-by: Su, Xiaomeng <suxiaomeng1@huawei.com>
50 lines
5.2 KiB
HTML
50 lines
5.2 KiB
HTML
<a name="dli_spark_atan"></a><a name="dli_spark_atan"></a>
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<h1 class="topictitle1">atan</h1>
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<div id="body8662426"><p id="dli_spark_atan__en-us_topic_0000001648002584_p14292114918339">This function is used to return the arc tangent value of a given angle <strong id="dli_spark_atan__en-us_topic_0000001648002584_b696184814555">a</strong>.</p>
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<div class="section" id="dli_spark_atan__en-us_topic_0000001648002584_section45291954203217"><h4 class="sectiontitle">Syntax</h4><pre class="screen" id="dli_spark_atan__en-us_topic_0000001648002584_screen19928459112517">atan(DOUBLE a)</pre>
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</div>
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<div class="section" id="dli_spark_atan__en-us_topic_0000001648002584_section992014913317"><h4 class="sectiontitle">Parameters</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="dli_spark_atan__en-us_topic_0000001648002584_table1829154762513" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameter</caption><thead align="left"><tr id="dli_spark_atan__en-us_topic_0000001648002584_row8830104792517"><th align="left" class="cellrowborder" valign="top" width="19.220000000000002%" id="mcps1.3.3.2.2.5.1.1"><p id="dli_spark_atan__en-us_topic_0000001648002584_p983074711252">Parameter</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="13.44%" id="mcps1.3.3.2.2.5.1.2"><p id="dli_spark_atan__en-us_topic_0000001648002584_p6830124732517">Mandatory</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="15.57%" id="mcps1.3.3.2.2.5.1.3"><p id="dli_spark_atan__en-us_topic_0000001648002584_p13318164512614">Type</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="51.77%" id="mcps1.3.3.2.2.5.1.4"><p id="dli_spark_atan__en-us_topic_0000001648002584_p08301547132513">Description</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="dli_spark_atan__en-us_topic_0000001648002584_row15830184792511"><td class="cellrowborder" valign="top" width="19.220000000000002%" headers="mcps1.3.3.2.2.5.1.1 "><p id="dli_spark_atan__en-us_topic_0000001648002584_p683034714250">a</p>
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</td>
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<td class="cellrowborder" valign="top" width="13.44%" headers="mcps1.3.3.2.2.5.1.2 "><p id="dli_spark_atan__en-us_topic_0000001648002584_p12830184752518">Yes</p>
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</td>
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<td class="cellrowborder" valign="top" width="15.57%" headers="mcps1.3.3.2.2.5.1.3 "><p id="dli_spark_atan__en-us_topic_0000001648002584_p0318545102615">DOUBLE, BIGINT, DECIMAL, or STRING</p>
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</td>
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<td class="cellrowborder" valign="top" width="51.77%" headers="mcps1.3.3.2.2.5.1.4 "><p id="dli_spark_atan__en-us_topic_0000001648002584_p18653154615263">The value can be a float, integer, or string.</p>
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<p id="dli_spark_atan__en-us_topic_0000001648002584_p9484232112711">If the value is not of the DOUBLE type, the system will implicitly convert it to the DOUBLE type for calculation.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="section" id="dli_spark_atan__en-us_topic_0000001648002584_section210162513312"><h4 class="sectiontitle">Return Values</h4><p id="dli_spark_atan__en-us_topic_0000001648002584_p1387835132114">The return value is of the DOUBLE type. The value ranges from -π/2 to π/2.</p>
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<div class="note" id="dli_spark_atan__en-us_topic_0000001648002584_note61422099395"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dli_spark_atan__en-us_topic_0000001648002584_ul10778141512238"><li id="dli_spark_atan__en-us_topic_0000001648002584_li1077814158233">If the value of <strong id="dli_spark_atan__en-us_topic_0000001648002584_b111577969731947">a</strong> is not within the range [-1,1], <strong id="dli_spark_atan__en-us_topic_0000001648002584_b31662417831947">NaN</strong> is returned.</li><li id="dli_spark_atan__en-us_topic_0000001648002584_li1555311815232">If the value of <strong id="dli_spark_atan__en-us_topic_0000001648002584_b162085490631313">a</strong> is <strong id="dli_spark_atan__en-us_topic_0000001648002584_b158486006531313">NULL</strong>, <strong id="dli_spark_atan__en-us_topic_0000001648002584_b151824685431313">NULL</strong> is returned.</li></ul>
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</div></div>
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</div>
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<div class="section" id="dli_spark_atan__en-us_topic_0000001648002584_section13277192233920"><h4 class="sectiontitle">Example Code</h4><p id="dli_spark_atan__en-us_topic_0000001648002584_p4301132713456">The value <strong id="dli_spark_atan__en-us_topic_0000001648002584_b718431415560">0.7853981633974483</strong> is returned.</p>
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<pre class="screen" id="dli_spark_atan__en-us_topic_0000001648002584_screen1026919331485">select atan(1);</pre>
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<p id="dli_spark_atan__en-us_topic_0000001648002584_p10347112913454">The value <strong id="dli_spark_atan__en-us_topic_0000001648002584_b969692919568">0.5404195002705842</strong> is returned.</p>
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<pre class="screen" id="dli_spark_atan__en-us_topic_0000001648002584_screen13837133954811">select atan(0.6);</pre>
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<p id="dli_spark_atan__en-us_topic_0000001648002584_p64991331184513">The value <strong id="dli_spark_atan__en-us_topic_0000001648002584_b13244737195617">NULL</strong> is returned.</p>
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<pre class="screen" id="dli_spark_atan__en-us_topic_0000001648002584_screen145784719480">select atan(null);</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dli_08_0473.html">Mathematical Functions</a></div>
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</div>
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</div>
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