Difference between revisions of "LlLog10"
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|func_id=264|func_sleep=0.0|func_energy=10.0 | |func_id=264|func_sleep=0.0|func_energy=10.0 | ||
|func=llLog10|return_type=float|p1_type=float|p1_name=val | |func=llLog10|return_type=float|p1_type=float|p1_name=val | ||
|func_footnote=To get the {{Wikipedia|Natural_logarithm|natural logarithm}} use | |func_footnote=To get the {{Wikipedia|Natural_logarithm|natural logarithm}} use [[llLog]].<br>llLog10 should only be used where the base 10 log is needed, all other applications should use [[llLog]] instead. | ||
|func_desc | |func_desc | ||
|return_text=that is the base 10 {{Wikipedia|Logarithm|logarithm}} of '''val'''.<br/>If '''val''' <= 0 return {{HoverText|zero|0.0}} instead. | |return_text=that is the base 10 {{Wikipedia|Logarithm|logarithm}} of '''val'''.<br/>If '''val''' <= 0 return {{HoverText|zero|0.0}} instead. | ||
|spec | |spec | ||
|caveats= | |caveats= | ||
|constants | |constants | ||
|examples=< | |examples=<lsl>default | ||
default | |||
{ | { | ||
state_entry() | state_entry() | ||
| Line 18: | Line 16: | ||
llOwnerSay("The base 10 logarithm of " + (string)num1 + " is " + (string)llLog10(num1)); | llOwnerSay("The base 10 logarithm of " + (string)num1 + " is " + (string)llLog10(num1)); | ||
} | } | ||
} | }</lsl> | ||
</ | |||
|helpers | |helpers | ||
|also_functions={{LSL DefineRow||[[llLog]]|}} | |also_functions={{LSL DefineRow||[[llLog]]|}} | ||
| Line 27: | Line 24: | ||
|also_tests | |also_tests | ||
|also_articles={{LSL DefineRow||{{Wikipedia|Logarithm}}|}} | |also_articles={{LSL DefineRow||{{Wikipedia|Logarithm}}|}} | ||
|notes | |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. | ||
<lsl>float LogBaseN = llLog(value) / llLog(Base); //This technique introduces errors but is the only way</lsl> | |||
|permission | |permission | ||
|negative_index | |negative_index | ||
Revision as of 18:12, 12 February 2008
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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
<lsl>default {
state_entry()
{
float num1 = llFrand(100.0);
llOwnerSay("The base 10 logarithm of " + (string)num1 + " is " + (string)llLog10(num1));
}
}</lsl>
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. <lsl>float LogBaseN = llLog(value) / llLog(Base); //This technique introduces errors but is the only way</lsl>