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std::log2

提供: cppreference.com
< cpp‎ | numeric‎ | math

 
 
ニューメリックスライブラリ
一般的な数学関数
浮動小数点環境
複素数
数値配列
擬似乱数生成
コンパイル時有理数演算 (C++11)
汎用の数値演算
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
一般的な数学関数
機能します
Original:
Functions
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基本操作
Original:
Basic operations
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remainder(C++11)
remquo(C++11)
fma(C++11)
fmax(C++11)
fmin(C++11)
fdim(C++11)
nan
nanf
nanl
(C++11)
(C++11)
(C++11)
指数関数
Original:
Exponential functions
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exp
exp2(C++11)
expm1(C++11)
log
log10
log1p(C++11)
log2(C++11)
電源機能
Original:
Power functions
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sqrt
cbrt(C++11)
hypot(C++11)
pow
三角関数や双曲線関数
Original:
Trigonometric and hyperbolic functions
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sinh
cosh
tanh
asinh(C++11)
acosh(C++11)
atanh(C++11)
エラーおよびガンマ関数
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Error and gamma functions
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erf(C++11)
erfc(C++11)
lgamma(C++11)
tgamma(C++11)
最も近い整数の浮動小数点演算
Original:
Nearest integer floating point operations
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ceil
floor
round
lround
llround
(C++11)
(C++11)
(C++11)
trunc(C++11)
nearbyint(C++11)
rint
lrint
llrint
(C++11)
(C++11)
(C++11)
点操作関数に浮かぶ
Original:
Floating point manipulation functions
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ldexp
scalbn
scalbln
(C++11)
(C++11)
ilogb(C++11)
logb(C++11)
frexp
modf
nextafter
nexttoward
(C++11)
(C++11)
copysign(C++11)
分類/比較
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Classification/Comparison
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fpclassify(C++11)
isfinite(C++11)
isinf(C++11)
isnan(C++11)
isnormal(C++11)
signbit(C++11)
isgreater(C++11)
isgreaterequal(C++11)
isless(C++11)
islessequal(C++11)
islessgreater(C++11)
isunordered(C++11)
マクロ定数
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Macro constants
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FP_NORMAL
FP_SUBNORMAL
FP_ZERO
FP_INFINITE
FP_NAN
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
 
Defined in header <cmath>
float       log2( float arg );
(C + + 11以来)
double      log2( double arg );
(C + + 11以来)
long double log2( long double arg );
(C + + 11以来)
double      log2( Integral arg );
(C + + 11以来)
2のベースargする対数を計算します.
Original:
Computes the base 2 logarithm of arg.
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[編集] パラメータ

arg -
浮動小数点値
Original:
floating point value
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[編集] 値を返します

log
2
(arg)

argが負の場合はドメイン·エラーが発生します。 NANはその場合に返されます.
Original:
Domain error occurs if arg is negative. NAN is returned in that case.
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arg0場合、範囲エラーが発生します。 -HUGE_VALはその場合に返されます.
Original:
Range error occurs if arg is 0. -HUGE_VAL is returned in that case.
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[編集] も参照してください

計算する自然(底 E)対数(底へ E)(ln(x)
Original:
computes natural (base e) logarithm (to base e) (ln(x))
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(機能) [edit]
(C++11)
戻り 2、与えられた電力(2x)に引き上げた
Original:
returns 2 raised to the given power (2x)
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(機能) [edit]
計算するコモン(ベース 10)対数(log10(x)
Original:
computes common (base 10) logarithm (log10(x))
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(機能) [edit]