$nav
===== Function: llLog10 =====

<code lsl2>
float llLog10(float arg)
</code>

Returns the logarithm in base ten of the argument.

===== Parameters =====

=== arg ===
The $lty[float] value whose logarithm in base 10 is to be calculated.

===== Return value =====

Returns a $lty[float] with the logarithm in base 10 of the argument.

===== Notes =====

  * In order to make sense, the argument must be greater than 0.0; a value of 0.0 or less yields 0.0.
  * The function returns $pinf if the input is $pinf, and 0.0 if the input is $minf or $nan.
  * To calculate the natural logarithm, $lfn[llLog] can be used.
    * To calculate the logarithm in any other base, there is a recipe in the Notes section of $lfn[llLog].
  * There is no built-in inverse of this function. To raise 10 to a power, you can use ''llPow(10, power)''. But if you want to raise 10 to an integer constant, better use scientific notation, for example ''1e32'' means 10 to the 32nd power (10<sup>32</sup>). See $lty[float] for a description of scientific notation.

===== Short examples =====

<code lsl2>
float f;
f = llLog10(10); // sets f to 1
f = llLog10(1);   // sets f to 0
f = llLog10(2);   // sets f to 0.301030 approx.
f = llLog10(0.5); // sets f to -0.301030 approx.
f = llLog10(-1);  // sets f to 0
</code>

===== See also =====

  * $lfn[llLog] to calculate the natural logarithm.
  * $lfn[llPow] to raise a number to a power (also called antilogarithm).
  * $lty[float] type and associated caveats and limitations.