QGIS/resources/function_help/clamp

<h3>clamp() function</h3>
Restricts an input value to a specified range.

<p><h4>Syntax</h4>
     clamp(<i>minimum</i>,<i>input</i>,<i>maximum</i>)</p>

<p><h4>Arguments</h4>
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<i>  minimum</i> &rarr; The smallest value <i>input</i> is allowed to take.<br>
<i>  input</i> &rarr; a value which will be restricted to the range specified by <i>minimum</i> and <i>maximum</i>.<br>
<i>  maximum</i> &rarr; The largest value <i>input</i> is allowed to take.<br>

<h4>Example</h4>
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     clamp(1,5,10) &rarr; 5 (<i>input</i> is between 1 and 10 so is returned unchanged)<br>
     clamp(1,0,10) &rarr; 1 (<i>input</i> is less than minimum value of 1, so function returns 1)<br>
     clamp(1,11,10) &rarr; 10 (<i>input</i> is greater than maximum value of 10, so function returns 10)<br>