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<div>Math functions in SQLite are available when SQLite’s amalgamation is compiled with </div>
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<span class="s1">-DSQLITE_ENABLE_MATH_FUNCTIONS</span></p>
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<span class="s1">However, since sqlite3 3.35, in March 2021, that option is on by default. I did a quick check with the latest released Ubuntu docker image for grass (so you could compare), and sqrt seems to work. Python has this enabled too for versions since
April 2021, including back ported versions of Python 3.8 </span><a href="https://github.com/python/cpython/issues/86852">https://github.com/python/cpython/issues/86852</a>, so there’s no reason it shouldn’t work. </p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">echoix /workspace/grass (main) $ docker run -it osgeo/grass-gis:releasebranch_8_3-ubuntu bash</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">root@83c468d748e4:/grassdb# grass</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">Starting GRASS GIS...</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">WARNING: It appears that the X Windows system is not active.</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">A graphical based user interface is not supported.</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">(DISPLAY variable is not set.)</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">Switching to text based interface mode.</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New"> </font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New"> __________ ___ __________ _______________</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New"> / ____/ __ \/ | / ___/ ___/ / ____/ _/ ___/</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New"> / / __/ /_/ / /| | \__ \\_ \ / / __ / / \__ \</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New"> / /_/ / _, _/ ___ |___/ /__/ / / /_/ // / ___/ /</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New"> \____/_/ |_/_/ |_/____/____/ \____/___//____/</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New"> </font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">Welcome to GRASS GIS 8.3.2dev (aeb4081)</font></span></p>
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<font face="Courier New"><span style="font-size: 15px;"><span class="s1">GRASS GIS homepage: </span><span class="s2" style="text-decoration: underline;">https://grass.osgeo.org</span></span></font></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">This version running through: Bash Shell (/bin/bash)</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">Help is available with the command: g.manual -i</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">See the licence terms with: g.version -c</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">See citation options with: g.version -x</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">Start the GUI with: g.gui wxpython</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">When ready to quit enter: exit</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New"> </font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">GRASS world_latlong_wgs84/PERMANENT:grassdb > sqlite3</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">SQLite version 3.37.2 2022-01-06 13:25:41</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">Enter ".help" for usage hints.</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">Connected to a transient in-memory database.</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">Use ".open FILENAME" to reopen on a persistent database.</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">sqlite> .version</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">SQLite 3.37.2 2022-01-06 13:25:41 872ba256cbf61d9290b571c0e6d82a20c224ca3ad82971edc46b29818d5dalt1</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">zlib version 1.2.11</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">gcc-11.4.0</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">sqlite> .exit</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">GRASS world_latlong_wgs84/PERMANENT:grassdb > db.select sql="select sqrt(2)"</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">sqrt(2)</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">1.4142135623731</font></span></p>
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<span class="s1" style="font-size: 15px;"><font face="Courier New">GRASS world_latlong_wgs84/PERMANENT:grassdb ></font></span></p>
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<div>You could check your versions, and come back if they are recent enough and should have them enabled, but aren’t. A little bit more info on your environment might be needed to fully understand in that case</div>
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<div>Have a great day!</div>
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<div dir="ltr">Edouard Choinière</div>
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<blockquote type="cite">Le 30 janv. 2024 à 04:41, Markus Neteler <neteler@osgeo.org> a écrit :<br>
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<div dir="ltr"><span>Hi Thiago,</span><br>
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<span>On Tue, Jan 30, 2024 at 1:05 AM Thiago Statella via grass-user</span><br>
<span><grass-user@lists.osgeo.org> wrote:</span><br>
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<blockquote type="cite"><span>Hi everyone!</span><br>
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<blockquote type="cite"><span>I need to populate a column in attribute table based on the square root of entries from another column.</span><br>
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<blockquote type="cite"><span>I tried the field calculator with no success. It seams that SQRT function is not supported by SQLite driver.</span><br>
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<blockquote type="cite"><span>Any help would be highly appreciated.</span><br>
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<span>Functionalities like sqrt() or log() are not available in base SQLite</span><br>
<span>(an issue unrelated to GRASS GIS). You will have to install an SQLite extension.</span><br>
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<span>See the v.db.update manual page and these wiki pages:</span><br>
<span>- https://grasswiki.osgeo.org/wiki/Build_SQLite_extension_on_Linux</span><br>
<span>- https://grasswiki.osgeo.org/wiki/Build_SQLite_extension_on_windows</span><br>
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<span>Regards,</span><br>
<span>Markus</span><br>
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<span>--</span><br>
<span>Markus Neteler, PhD</span><br>
<span>https://www.mundialis.de - company</span><br>
<span>https://grass.osgeo.org - FOSS</span><br>
<span>https://neteler.org - blog & freelancing</span><br>
<span></span><br>
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