QGIS/resources/function_help/log

<h3>log() function</h3>
Returns the value of the logarithm of the passed value and base.
<br>
This function takes two arguments.
<h4>Syntax</h4>
<code>log(base, value)</code><br>

<h4>Arguments</h4>
<code>base</code> - any positive number.<br>
<code>value</code> - any positive number.
<br>

<h4>Example</h4>
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<code>log(2, 32) &rarr; 5</code><br>
<code>log(0.5, 32) &rarr; -5</code><br>