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functions:lllog [2015-01-31 09:34 SLT] sei style |
functions:lllog [2015-02-04 08:18 SLT] (current) sei pinf minf nan econst |
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| </code> | </code> | ||
| - | Returns the natural logarithm of the argument. The natural logarithm is a logarithm in base **e** (the Euler constant, which is approximately 2.7182818). | + | Returns the natural logarithm of the argument. The natural logarithm is a logarithm in base $econst (the Euler constant, which is approximately 2.7182818). |
| ===== Parameters ===== | ===== Parameters ===== | ||
| Line 20: | Line 20: | ||
| * 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 logarithm in base 10, $lfn[llLog10] can be used. | * To calculate the logarithm in base 10, $lfn[llLog10] can be used. | ||
| * To calculate the logarithm in any other base, divide the result of this function by the logarithm of that base. | * To calculate the logarithm in any other base, divide the result of this function by the logarithm of that base. | ||