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functions:lllog10 [2014-05-16 07:59 SLT] sei created |
functions:lllog10 [2015-02-04 08:15 SLT] (current) sei style |
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| ===== Function: llLog10 ===== | ===== Function: llLog10 ===== | ||
| <code lsl2> | <code lsl2> | ||
| - | float llLog(float arg) | + | float llLog10(float arg) |
| </code> | </code> | ||
| - | Returns the natural logarithm of the argument. | + | Returns the logarithm in base ten of the argument. |
| ===== Parameters ===== | ===== Parameters ===== | ||
| === arg === | === arg === | ||
| - | The float value whose natural logarithm is to be calculated. | + | The $lty[float] value whose logarithm in base 10 is to be calculated. |
| - | ===== Result ===== | + | ===== Return value ===== |
| - | The natural logarithm of the argument. | + | Returns a $lty[float] with the logarithm in base 10 of the argument. |
| ===== Notes ===== | ===== Notes ===== | ||
| * In order to make sense, the argument must be greater than 0.0; a value of 0.0 or less yields 0.0. | * 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 **Infinity** if the input is **Infinity**, and 0.0 if the input is **-Infinity** or **NaN**. | + | * The function returns $pinf if the input is $pinf, and 0.0 if the input is $minf or $nan. |
| - | * To calculate the natural logarithm, [[llLog]] can be used. | + | * 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 [[llLog]]. | + | * 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 ===== | ===== Short examples ===== | ||
| Line 30: | Line 32: | ||
| f = llLog10(1); // sets f to 0 | f = llLog10(1); // sets f to 0 | ||
| f = llLog10(2); // sets f to 0.301030 approx. | f = llLog10(2); // sets f to 0.301030 approx. | ||
| - | f = llLog(0.5); // sets f to -0.301030 approx. | + | f = llLog10(0.5); // sets f to -0.301030 approx. |
| - | f = llLog(-1); // sets f to 0 | + | f = llLog10(-1); // sets f to 0 |
| </code> | </code> | ||
| ===== See also ===== | ===== See also ===== | ||
| - | * [[llLog]] to calculate the natural logarithm. | + | * $lfn[llLog] to calculate the natural logarithm. |
| - | * [[llPow]] to raise a number to a power (also called antilogarithm). | + | * $lfn[llPow] to raise a number to a power (also called antilogarithm). |
| + | * $lty[float] type and associated caveats and limitations. | ||