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erf - 誤差関数
erfc - 誤差関数の補関数とその累次積分
erfi - 虚誤差関数
使い方
erf(x)
erfc(x)
erfc(n, x)
erfi(x)
パラメータ
x - 代数式
n - 代数式, -1 以上の整数のみを取れる
説明
誤差関数はすべての複素数に対して次のように定義されます。
erf(x) = 2/sqrt(Pi) * int(exp(-t^2), t=0..x)
補誤差関数は次で定義されます。
erfc(x) = 1 - erf(x) = 1 - 2/Pi^(1/2) * int(exp(-t^2), t=0..x)
補誤差関数の累次積分は次で定義されます。
erfc(-1, x) = 2/sqrt(Pi) * exp(-x^2) erfc(n, x) = int(erfc(n-1,t), t=x..infinity) n >= 0
(注意 erfc(0,x) = erfc(x).)
虚誤差関数は次で定義されます。
erfi(x) = -I*erf(I*x) = 2/sqrt(Pi) * int(exp(t^2), t=0..x)
これらすべての関数は整関数です。
参考文献: A. Erdelyi, Higher Transcendental Functions, Volume 2, McGraw-Hill, 1953.
例
erf(3);
evalf(%);
erfc(3.);
erf(1.-1.*I);
erfc(1.5-2.85*I);
diff(erfc(5,x), x);
erfi(-x);
series(erfi(x),x,4);
expand(erfc(2,x),x);
convert(%,erfc);
参照
Fresnel, dawson, convert, inifcns
Download Help Document