llLog
function
Function syntax
float llLog(float val// Number to compute the logarithm of.
);- Returns
float- Energy
- 10
To get the base 10 logarithm use llLog10.
Returns a float that is the natural logarithm of val.
If val <= 0 return 0.0 instead.
float result = llLog(0.0);Examples
Section titled “Examples”Example 1
default{ state_entry() { float num1 = llFrand(100.0);
llOwnerSay("The natural logarithm of " + (string)num1 + " is " + (string)llLog(num1)); }}Example 2
float findexp(float result, float base){ return llLog(result)/llLog(base);}default{ touch_start(integer total_number) { llSay(0, (string)findexp(8.0,2.0)); //returns 3.0 }}There are only two log functions llLog and llLog10. Errors introduced as a result of floating-point arithmetic are most noticable when working with logarithms. llLog should be used instead of llLog10 when converting the base of the logarithm.
float LogBaseN = llLog(value) / llLog(Base); //This technique introduces errors but is the only wayIf Base is a constant, your script will run faster if you calculate it’s log and divide by that constant instead.
Useful natural logarithms
| Number | logarithm |
|---|---|
| 2 | |
| 4 | |
| 8 | |
| 10 | |
| 16 | |
| 32 | |
| 64 | |
| 128 | |
| 256 |
See also
Section titled “See also”Functions
Section titled “Functions”Articles
Section titled “Articles”Original wiki source
Some wiki templates and tables need their original context. View this article on the Second Life Wiki. Technical wording and examples are retained from the source; historical guidance may differ from current behavior.