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functions:llfabs [2015-01-31 09:30 SLT] sei style |
functions:llfabs [2015-02-04 13:07 SLT] (current) sei remove extra bracket |
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| Returns a $lty[float] that is the absolute value of $prm[fval], that is, the value with any negative sign removed. | Returns a $lty[float] that is the absolute value of $prm[fval], that is, the value with any negative sign removed. | ||
| - | More rigorously, the result will be the same as $prm[fval] if $prm[fval] is positive or zero, and $prm[-fval]] if it is negative. | + | More rigorously, the result will be the same as $prm[fval] if $prm[fval] is positive or zero, and $prm[-fval] if it is negative. |
| ===== Notes ===== | ===== Notes ===== | ||
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| * To determine the absolute value of an $lty[integer], use $lfn[llAbs]. | * To determine the absolute value of an $lty[integer], use $lfn[llAbs]. | ||
| * "Minus zero" (-0.0) is a special case of a $ty[float] that can rarely appear in some situations. The absolute value of Minus zero is returned by this function unchanged (as -0.0). This should not be a concern anyway, as minus zero is mostly transparent to all calculations (e.g. minus zero is considered equal to zero, and doesn't err when taking its square root). | * "Minus zero" (-0.0) is a special case of a $ty[float] that can rarely appear in some situations. The absolute value of Minus zero is returned by this function unchanged (as -0.0). This should not be a concern anyway, as minus zero is mostly transparent to all calculations (e.g. minus zero is considered equal to zero, and doesn't err when taking its square root). | ||
| - | * The absolute value of **NaN** is **NaN**. The absolute value of **Infinity** and **-Infinity** is **Infinity**. | + | * The absolute value of $nan is $nan. The absolute value of $pinf and $minf is $pinf. |
| ===== Short examples ===== | ===== Short examples ===== | ||