sqrt EXPR
sqrt
Return the positive square root of EXPR. If EXPR is omitted, uses $_. Works only for non-negative operands unless you've loaded the Math::Complex module.
返回 EXPR 的正平方根。 如果省略 EXPR，则使用 $_。 仅适用于非负操作数，除非您已加载 Math::Complex 模块。
1 $ print sqrt(4); 2 Took 0 seconds. 3 1 4 $ 2 5 Took 0.000326871871948242 seconds. 6 $ print sqrt(-4); 7 Took 0.000407934188842773 seconds. 8 Runtime error: Can‘t‘ take sqrt of -4 at (eval 696) line 5. 9 $ use Math::Complex; 10 Took 0.0199921131134033 seconds. 11 $ print sqrt(-4); 12 Took 0.000523805618286133 seconds. 13 1 14 $ 2i
- sin EXPR
- sin
-
Returns the sine of EXPR (expressed in radians). If EXPR is omitted, returns sine of
$_.For the inverse sine operation, you may use the
Math::Trig::asinfunction, or use this relation:
返回 EXPR 的正弦值（以弧度表示）。 如果省略 EXPR，则返回 $_ 的正弦值。
对于反正弦运算，您可以使用 Math::Trig::asin 函数，或使用以下关系：
sub asin { atan2($_[0], sqrt(1 - $_[0] * $_[0])) }
1 $ asin 3; 2 Took 0 seconds. 3 1.5707963267949-1.76274717403909i 4 $ sin 3; 5 Took 0 seconds. 6 0.141120008059867
1 $ $caller; 2 Took 0 seconds. 3 Compile error: Global symbol "$caller" requires explicit package name at (eval 713) line 5. 4 BEGIN not safe after errors--compilation aborted at (eval 713) line 5. 5 $ $FuncLib_SYC_INTERFACE::caller; 6 Took 0 seconds. 7 $ print $FuncLib_SYC_INTERFACE; 8 Took 0.0099940299987793 seconds. 9 Compile error: Global symbol "$FuncLib_SYC_INTERFACE" requires explicit package name at (eval 715) line 5. 10 BEGIN not safe after errors--compilation aborted at (eval 715) line 5. 11 $ print $FuncLib_SYC_INTERFACE::caller; 12 Use of uninitialized value $FuncLib_SYC_INTERFACE::caller in print at (eval 716) line 5. 13 Took 0.00053715705871582 seconds. 14 1 $ caller(FucLib_TNT_SYC_INTERFACE); 15 Took 0 seconds. 16 Compile error: Bareword "FucLib_TNT_SYC_INTERFACE" not allowed while "strict subs" in use at (eval 717) line 5. 17 $ caller('FucLib_TNT_INTERFACE'); 18 Argument "FucLib_TNT_INTERFACE" isn't numeric in caller at (eval 718) line 5. 19 Took 0.000524997711181641 seconds. 20 [ 21 "Lexical::Persistence", 22 "C:/TurboLIFT/Perl512/site/lib/Lexical/Persistence.pm", 23 340, 24 "Devel::REPL::Plugin::Packages::DefaultScratchpad::__ANON__", 25 1, 26 1, 27 undef, 28 undef, 29 1538, 30 "UUUUUUUUUUUUUU\25", 31 undef 32 ] 33 $