Difference between revisions of "LlFabs"
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Frionil Fang (talk | contribs) (like llAbs, llFabs isn't strictly necessary, though can't bitshift so avoiding the function isn't quite as powerful and it produces NaNs for infinity/+0 for -0) |
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{{ | {{LSL Function | ||
|func=llFabs | |inject-2={{Issues/SCR-439}} | ||
|func_id=7 | |func=llFabs|sort=Fabs | ||
|func_sleep=0.0 | |func_id=7|func_sleep=0.0|func_energy=10.0 | ||
|func_energy=10.0 | |||
|func_footnote | |func_footnote | ||
|p1_type=float | |p1_type=float|p1_name=val|p1_desc=Any valid float value | ||
|p1_name=val | |||
|p1_desc=Any valid float value | |||
|return_type=float | |return_type=float | ||
|return_text=that is the positive version of val. | |return_text=that is the positive version of {{LSLP|val}}. | ||
|other_languages={{LSL OL|C++|[http://www.cplusplus.com/reference/cmath/fabs/ fabs]}} | |||
|spec | |spec | ||
|caveats | |caveats | ||
|examples= | |examples= | ||
< | <source lang="lsl2"> | ||
default | default | ||
{ | { | ||
state_entry() | state_entry() | ||
{ | { | ||
llSay(0,"The absolute value of -4.5 is: "+(string)llFabs(-4.5) ); | llSay(0,"The (Float)absolute value of -4.5 is: "+(string)llFabs(-4.5) ); | ||
} | } | ||
} | } | ||
</ | // returns : | ||
// The (Float)absolute value of -4.5 is: 4.500000 | |||
</source> | |||
|helpers | |helpers | ||
| | |also_functions={{LSL DefineRow||[[llAbs]]|[[integer]] version of llFabs}} | ||
|also_events | |||
|also_articles= | |also_articles={{LSL DefineRow||{{Wikipedia|Absolute value}}|}} | ||
|notes=*Using <code>{{LSLP|val}}-2*{{LSLP|val}}*({{LSLP|val}}<0)</code> is roughly 60% faster than llFabs as it avoids a function call, though it produces {{abbr|NaN|not a number}} if given an infinite value and (correctly) returns 0.0 instead of -0.0 when taking the absolute value of negative zero. | |||
| | |cat1=Math | ||
|cat2=Float | |||
|cat3 | |||
|cat4 | |||
|haiku={{Haiku|Even with all your little bits intact,|down to the final point|it's still size that matters.}} | |||
}} | }} | ||
Latest revision as of 14:11, 28 October 2023
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Summary
Function: float llFabs( float val );
| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns a float that is the positive version of val.
| • float | val | – | Any valid float value |
| This function is similar to functions () found in many other languages: | ||
|---|---|---|
|
Examples
default
{
state_entry()
{
llSay(0,"The (Float)absolute value of -4.5 is: "+(string)llFabs(-4.5) );
}
}
// returns :
// The (Float)absolute value of -4.5 is: 4.500000
Notes
- Using
val-2*val*(val<0)is roughly 60% faster than llFabs as it avoids a function call, though it produces NaN if given an infinite value and (correctly) returns 0.0 instead of -0.0 when taking the absolute value of negative zero.
See Also
Deep Notes
Signature |
|---|
function float llFabs( float val ); |
Haiku |
|---|
|
Even with all your little bits intact,
|