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functions:llasin [2014-05-15 05:13 SLT] sei [Result] Mention it's an angle in radians |
functions:llasin [2015-09-23 14:34 SLT] (current) sei Style |
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| + | $nav | ||
| ===== Function: llAsin ===== | ===== Function: llAsin ===== | ||
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| </code> | </code> | ||
| - | Return the inverse sine of the argument, in radians. The inverse sine is the angle whose sine is the given argument. | + | Return the inverse sine of the argument, in radians. The inverse sine (also known as arcsine) is the angle whose sine is the given argument. |
| ===== Parameters ===== | ===== Parameters ===== | ||
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| Number whose inverse sine is to be found. | Number whose inverse sine is to be found. | ||
| - | ===== Result ===== | + | ===== Return value ===== |
| - | [[types/Float]] number with the angle in radians that is the inverse sine of the argument. | + | $lty[Float] number with the angle in radians that is the inverse sine of the argument. |
| ===== Notes ===== | ===== Notes ===== | ||
| - | * The range of **arg** must be between -1 and 1, because the sine of any angle can't be outside that range. | + | * The range of $prm[arg] must be between -1 and 1, because the sine of any angle can't be outside that range. |
| - | * The result is always between -[[constants/PI_BY_TWO]] and **PI_BY_TWO**, or **NaN** (Not a Number) if the argument is out of range. | + | * The result is always between -$lct[PI_BY_TWO] and $ct[PI_BY_TWO, or $nan if the argument is out of the valid range. |
| ===== Short examples ===== | ===== Short examples ===== | ||
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| angle = llAsin(-1); // Sets angle to -PI_BY_TWO, because the sine of -PI_BY_TWO is -1. | angle = llAsin(-1); // Sets angle to -PI_BY_TWO, because the sine of -PI_BY_TWO is -1. | ||
| angle = llAsin(0.67); // Sets angle to approximately 0.734209 (the sine of that is 0.67) | angle = llAsin(0.67); // Sets angle to approximately 0.734209 (the sine of that is 0.67) | ||
| - | angle = llAsin(2); // Sets angle to NaN (Not a Number) because there's no number whose sine is 2. | + | |
| + | angle = llAsin(2); // Under Mono, sets angle to NaN (Not a Number) | ||
| + | // because there's no number whose sine is 2. | ||
| + | // Crashes with a math error under LSO. | ||
| </code> | </code> | ||
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| ===== See also ===== | ===== See also ===== | ||
| - | === Related trigonometric functions === | + | * $lfn[llSin] calculates the sine of the argument. |
| - | * [[llSin]] | + | * $lfn[llAcos] calculates the inverse cosine of the argument. |
| - | + | * $lfn[llCos] calculates the cosine of the argument. | |
| - | === Other trigonometric functions === | + | * $lfn[llAtan2] calculates the angle of a 2D vector. |
| - | * [[llAcos]] | + | * $lfn[llTan] calculates the tangent of the argument. |
| - | * [[llCos]] | + | * Other $lfn[math/] functions |
| - | * [[llAtan2]] | + | |
| - | * [[llTan]] | + | |