Difference between revisions of "LlLog10"
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{{ | {{LSL Function | ||
|func_id=264|func_sleep=0.0|func_energy=10.0 | |||
|func=llLog10|return_type=float|p1_type=float|p1_name=val | |||
|func_footnote=To get the {{Wikipedia|natural logarithm|w=n}} use [[llLog]].<br/>llLog10 should only be used where the base 10 log is needed, all other applications should use [[llLog]] instead. | |||
|func_desc | |||
|return_text=that is the base 10 {{Wikipedia|logarithm|w=n}} of '''val'''.<br/>If '''val''' <= 0 return {{HoverText|zero|0.0}} instead. | |||
|spec | |||
|caveats= | |||
|constants | |||
|examples=<source lang="lsl2">default | |||
{ | |||
state_entry() | |||
{ | |||
float num1 = llFrand(100.0); | |||
llOwnerSay("The base 10 logarithm of " + (string)num1 + " is " + (string)llLog10(num1)); | |||
} | |||
}</source> | |||
|helpers | |||
|also_functions={{LSL DefineRow||[[llLog]]|}} | |||
{{LSL DefineRow||[[llPow]]|}} | |||
{{LSL DefineRow||[[llSqrt]]|}} | |||
|also_events | |||
|also_tests | |||
|also_articles={{LSL DefineRow||{{Wikipedia|Logarithm}}|}} | |||
|notes=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. | |||
<source lang="lsl2">float LogBaseN = llLog(value) / llLog(Base); //This technique introduces errors but is the only way</source> | |||
|permission | |||
|negative_index | |||
|sort=Log10 | |||
|cat1=Math | |||
|cat2 | |||
|cat3 | |||
|cat4 | |||
}} | |||
Latest revision as of 12:20, 22 January 2015
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Summary
Function: float llLog10( float val );| 264 | Function ID |
| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns a float that is the base 10 
logarithm of val.
If val <= 0 return zero instead.
| • float | val |
To get the natural logarithm use llLog.
llLog10 should only be used where the base 10 log is needed, all other applications should use llLog instead.
Caveats
Examples
default
{
state_entry()
{
float num1 = llFrand(100.0);
llOwnerSay("The base 10 logarithm of " + (string)num1 + " is " + (string)llLog10(num1));
}
}
Notes
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 way