2009年3月8日 星期日

數學常數

常數名常數值描述
M_PI3.14159265358979323846Pi
M_E2.7182818284590452354e
M_LOG2E1.4426950408889634074log_2 e
M_LOG10E0.43429448190325182765log_10 e
M_LN20.69314718055994530942log_e 2
M_LN102.30258509299404568402log_e 10
M_PI_21.57079632679489661923pi/2
M_PI_40.78539816339744830962pi/4
M_1_PI0.318309886183790671541/pi
M_2_PI0.636619772367581343082/pi
M_SQRTPI1.77245385090551602729sqrt(pi) [4.0.2]
M_2_SQRTPI1.128379167095512573902/sqrt(pi)
M_SQRT21.41421356237309504880sqrt(2)
M_SQRT31.73205080756887729352sqrt(3) [4.0.2]
M_SQRT1_20.707106781186547524401/sqrt(2)
M_LNPI1.14472988584940017414log_e(pi) [4.0.2]
M_EULER0.57721566490153286061Euler constant [4.0.2]


  • acos -- Arc cosine
  • acosh -- Inverse hyperbolic cosine
  • asin -- Arc sine
  • asinh -- Inverse hyperbolic sine
  • atan2 -- arc tangent of two variables
  • atan -- Arc tangent
  • atanh -- Inverse hyperbolic tangent
  • base_convert -- Convert a number between arbitrary bases
  • bindec -- Binary to decimal
  • ceil -- Round fractions up
  • cos -- 餘弦
  • cosh -- Hyperbolic cosine
  • decbin -- Decimal to binary
  • dechex -- Decimal to hexadecimal
  • decoct -- Decimal to octal
  • deg2rad -- Converts the number in degrees to the radian equivalent
  • exp -- Calculates the exponent of e (the Neperian or Natural logarithm base)
  • expm1 -- Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
  • floor -- Round fractions down
  • fmod -- Returns the floating point remainder (modulo) of the division of the arguments
  • getrandmax -- Show largest possible random value
  • hexdec -- Hexadecimal to decimal
  • hypot -- Returns sqrt( num1*num1 + num2*num2)
  • is_finite --
  • is_infinite --
  • is_nan --
  • lcg_value -- Combined linear congruential generator
  • log10 -- 以10為底的對數
  • log1p -- Returns log(1 + number), computed in a way that accurate even when the val ue of number is close to zero
  • log -- 自然對數
  • max -- Find highest value
  • min -- Find lowest value
  • mt_getrandmax -- Show largest possible random value
  • mt_rand -- Generate a better random value
  • mt_srand -- Seed the better random number generator
  • octdec -- Octal to decimal
  • pi -- 得到圓周率值
  • pow -- Exponential expression
  • rad2deg -- Converts the radian number to the equivalent number in degrees
  • rand -- Generate a random value
  • round -- Rounds a float
  • sin -- 正弦
  • sinh -- Hyperbolic sine
  • sqrt -- Square root
  • srand -- Seed the random number generator
  • tan -- 正切
  • tanh -- Hyperbolic tangent


參考


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