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fastmath.special

Special functions for real arguments and value.

  • Bessel J, Y, jinc
  • Modified Bessel I, K
  • Spherical Bessel j, y
  • Modified spherical Bessel i1, i2, k
  • Gamma, log, digamma, trigamma, polygamma, regularized, lower/upper incomplete
  • Beta, log, regularized, incomplete
  • Erf, inverse
  • Airy A, B with derivatives
  • Zeta (Riemann, Hurwitz), Eta (Dirichlet), Xi (Landau), Beta (Dirichlet)
  • Integrals: Si, Ci, li/Li, Ei, En, Ein
  • Hypergeometric 0F0, 0F1, 1F0, 1F1, 2F1, 2F0, 0F2, pFq, Kummers M, Tricomis U, Whittaker M and W
  • Lambert W (0 and -1)
  • Minkowski
  • Harmonic H
Special functions for real arguments and value.

* Bessel J, Y, jinc
* Modified Bessel I, K 
* Spherical Bessel j, y
* Modified spherical Bessel i1, i2, k
* Gamma, log, digamma, trigamma, polygamma, regularized, lower/upper incomplete
* Beta, log, regularized, incomplete
* Erf, inverse
* Airy A, B with derivatives
* Zeta (Riemann, Hurwitz), Eta (Dirichlet), Xi (Landau), Beta (Dirichlet)
* Integrals: Si, Ci, li/Li, Ei, En, Ein
* Hypergeometric 0F0, 0F1, 1F0, 1F1, 2F1, 2F0, 0F2, pFq, Kummers M, Tricomis U, Whittaker M and W
* Lambert W (0 and -1)
* Minkowski
* Harmonic H
raw docstring

airy-Aiclj

(airy-Ai x)

Airy Ai function

Airy Ai function
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airy-Ai'clj

(airy-Ai' x)

First derivative of the Airy Ai function

First derivative of the Airy Ai function
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airy-Biclj

(airy-Bi x)

Airy Bi function

Airy Bi function
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airy-Bi'clj

(airy-Bi' x)

First derivative of the Airy Bi function

First derivative of the Airy Bi function
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bessel-Iclj

(bessel-I order x)

Modified Bessel function of the first kind of order v, I_v(x)

Modified Bessel function of the first kind of order v, I_v(x)
sourceraw docstring

bessel-I0clj

(bessel-I0 x)

Modified Bessel function of the first kind of order 0, I_0(x)

Modified Bessel function of the first kind of order 0, I_0(x)
sourceraw docstring

bessel-I1clj

(bessel-I1 x)

Modified Bessel function of the first kind of order 1, I_0(x)

Modified Bessel function of the first kind of order 1, I_0(x)
sourceraw docstring

bessel-Jclj

(bessel-J order x)

Bessel function of the first kind of order v, J_v(x)

Bessel function of the first kind of order v, J_v(x)
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bessel-J0clj

(bessel-J0 x)

Bessel function of the first kind of order 0, J_0(x)

Bessel function of the first kind of order 0, J_0(x)
sourceraw docstring

bessel-J1clj

(bessel-J1 x)

Bessel function of the first kind of order 1, J_1(x)

Bessel function of the first kind of order 1, J_1(x)
sourceraw docstring

bessel-Kclj

(bessel-K order x)

Modified Bessel function of the second kind and real order v, K_v(x)

Modified Bessel function of the second kind and real order v, K_v(x)
sourceraw docstring

bessel-K-half-oddclj

(bessel-K-half-odd odd-numerator x)

Bessel K_a function for a = order/2

Function accepts only odd integers for order

Bessel K_a function for a = order/2

Function accepts only odd integers for order
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bessel-K0clj

(bessel-K0 x)

Modified Bessel function of the second kind of order 0, K_0(x)

Modified Bessel function of the second kind of order 0, K_0(x)
sourceraw docstring

bessel-K1clj

(bessel-K1 x)

Modified Bessel function of the second kind of order 1, K_1(x)

Modified Bessel function of the second kind of order 1, K_1(x)
sourceraw docstring

bessel-Yclj

(bessel-Y order x)

Bessel function of the second kind of order v, Y_v(x)

Bessel function of the second kind of order v, Y_v(x)
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bessel-Y0clj

(bessel-Y0 x)

Bessel function of the second kind of order 0, Y_0(x)

Bessel function of the second kind of order 0, Y_0(x)
sourceraw docstring

bessel-Y1clj

(bessel-Y1 x)

Bessel function of the second kind of order 1, Y_1(x)

Bessel function of the second kind of order 1, Y_1(x)
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betaclj

(beta p q)

Beta function

Beta function
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Ciclj

(Ci x)

Cosine integral

Cosine integral
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Cinclj

(Cin x)

Cosine integral, alternative definition

Cosine integral, alternative definition
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digammaclj

(digamma x)

First derivative of log of Gamma function.

First derivative of log of Gamma function.
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dirichlet-betaclj

(dirichlet-beta x)

Dirichlet Beta function

Dirichlet Beta function
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E0clj

(E0 x)

Exponential integral E0

Exponential integral E0
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E1clj

(E1 x)

Exponential integral E1 for positive real numbers

Exponential integral E1 for positive real numbers
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Eiclj

(Ei x)

Exponential integral

Exponential integral
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Einclj

(Ein x)

Exponential integral, alternative definition

Exponential integral, alternative definition
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Enclj

(En n x)

Generalized exponential integral En

Generalized exponential integral En
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erfclj

(erf x)
(erf x1 x2)

Error function.

For two arguments returns a difference between (erf x2) and (erf x1).

Error function.

For two arguments returns a difference between `(erf x2)` and `(erf x1)`.
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erfcclj

(erfc x)

Complementary error function.

Complementary error function.
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etaclj

(eta x)

Dirichlet Eta function

Dirichlet Eta function
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gammaclj

(gamma x)

Gamma function $\Gamma(x)$. Extension of the factorial.

Gamma function $\Gamma(x)$. Extension of the factorial.
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harmonic-numberclj

(harmonic-number n)
(harmonic-number n m)

Harmonic number H_n or generalized harmonic number H_n,m

Harmonic number H_n or generalized harmonic number H_n,m
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hypergeometric-0F0clj

(hypergeometric-0F0 x)

Hypergeometric ₀F₀ function, exp(x)

Hypergeometric ₀F₀ function, exp(x)
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hypergeometric-0F1clj

(hypergeometric-0F1 a x)

Confluent hypergeometric ₀F₁ limit function.

Confluent hypergeometric ₀F₁ limit function.
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hypergeometric-0F2clj

(hypergeometric-0F2 a b x)

Generalized hypergeometric ₀F₂ function.

Generalized hypergeometric ₀F₂ function.
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hypergeometric-1F0clj

(hypergeometric-1F0 a x)

Hypergeometric ₁F₀ function.

Hypergeometric ₁F₀ function.
sourceraw docstring

hypergeometric-1F1clj

(hypergeometric-1F1 a b x)

Confluent hypergeometric ₁F₁ function of the first kind, Kummer's M.

Confluent hypergeometric ₁F₁ function of the first kind, Kummer's M.
sourceraw docstring

hypergeometric-2F0clj

(hypergeometric-2F0 a b x)

Generalized hypergeometric ₂F₀ function.

Generalized hypergeometric ₂F₀ function.
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hypergeometric-2F1clj

(hypergeometric-2F1 a b c x)

Gauss's hypergeometric ₂F₁ function.

Gauss's hypergeometric ₂F₁ function.
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hypergeometric-pFqclj

(hypergeometric-pFq ps qs z)
(hypergeometric-pFq ps qs z max-iters)

hypergeometric-pFq using MacLaurin series.

max-iters is set to 1000000 by default.

hypergeometric-pFq using MacLaurin series.

`max-iters` is set to 1000000 by default.
sourceraw docstring

hypergeometric-pFq-ratioclj

(hypergeometric-pFq-ratio ps qs z)
(hypergeometric-pFq-ratio ps qs z max-iters)

Hypergeometric-pFq using MacLaurin series on ratios. Can be very slow.

max-iters is set to 10000 by default.

Hypergeometric-pFq using MacLaurin series on ratios. Can be very slow.

`max-iters` is set to 10000 by default.
sourceraw docstring

incomplete-betaclj

(incomplete-beta x a b)

Incomplete Beta B(x,a,b)

Incomplete Beta B(x,a,b)
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inv-erfclj

(inv-erf x)

Inverse of erf function.

Inverse of [[erf]] function.
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inv-erfcclj

(inv-erfc x)

Inverse of erfc function.

Inverse of [[erfc]] function.
sourceraw docstring

inv-gamma-1pm1clj

(inv-gamma-1pm1 x)

$\frac{1}{\Gamma(1+x)}-1$ for $-0.5≤x≤1.5$.

$\frac{1}{\Gamma(1+x)}-1$ for $-0.5≤x≤1.5$.
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jincclj

(jinc x)

Besselj1 devided by x

Besselj1 devided by `x`
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kummers-Mclj

(kummers-M a b x)

Kummer's (confluent hypergeometric, 1F1) function for real arguments.

Kummer's (confluent hypergeometric, 1F1) function for real arguments.
sourceraw docstring

lambert-Wclj

(lambert-W x)

Lambert W_0 function. W(xe^x)=x for x>=-1.0.

Lambert W_0 function. W(xe^x)=x for x>=-1.0.
sourceraw docstring

lambert-W-1clj

(lambert-W-1 x)

Lambert W_1 function. W_1(xe^x)=x for x<=-1.0.

Lambert W_1 function. W_1(xe^x)=x for x<=-1.0.
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Liclj

(Li x)

Offset logarythmic integral

Offset logarythmic integral
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liclj

(li x)

Logarythmic integral

Logarythmic integral
sourceraw docstring

log-betaclj

(log-beta p q)

Logarithm of Beta function.

Logarithm of Beta function.
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log-gammaclj

(log-gamma x)

Log of Gamma function $\log\Gamma(x)$.

Log of Gamma function $\log\Gamma(x)$.
sourceraw docstring

log-gamma-1pclj

(log-gamma-1p x)

$\ln\Gamma(1+x)$ for $-0.5≤x≤1.5$.

$\ln\Gamma(1+x)$ for $-0.5≤x≤1.5$.
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lower-incomplete-gammaclj

(lower-incomplete-gamma s x)

Lower incomplete gamma function

Lower incomplete gamma function
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minkowskiclj

(minkowski x)

Minkowski's question mark function ?(x)

Minkowski's question mark function ?(x)
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polygammaclj

(polygamma m x)

Polygamma function of order m and real argument.

Polygamma function of order `m` and real argument.
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regularized-betaclj

(regularized-beta x a b)

Regularized Beta I_x(a,b)

Regularized Beta I_x(a,b)
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regularized-gamma-pclj

(regularized-gamma-p a x)

Regularized gamma P(a,x)

Regularized gamma P(a,x)
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regularized-gamma-qclj

(regularized-gamma-q a x)

Regularized gamma Q(a,x)

Regularized gamma Q(a,x)
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Siclj

(Si x)

Sine integral

Sine integral
sourceraw docstring

siclj

(si x)

Sine integral, Si shifted by -pi/2

Sine integral, Si shifted by -pi/2
sourceraw docstring

spherical-bessel-1-iclj

(spherical-bessel-1-i order x)

First modified spherical Bessel function of the first kind.

First modified spherical Bessel function of the first kind.
sourceraw docstring

spherical-bessel-1-i0clj

(spherical-bessel-1-i0 x)

First modified spherical Bessel function of the first kind and order 0.

First modified spherical Bessel function of the first kind and order 0.
sourceraw docstring

spherical-bessel-1-i1clj

(spherical-bessel-1-i1 x)

First modified spherical Bessel function of the first kind and order 1.

First modified spherical Bessel function of the first kind and order 1.
sourceraw docstring

spherical-bessel-1-i2clj

(spherical-bessel-1-i2 x)

First modified spherical Bessel function of the first kind and order 2.

First modified spherical Bessel function of the first kind and order 2.
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spherical-bessel-2-iclj

(spherical-bessel-2-i order x)

Second modified spherical Bessel function of the first kind.

Second modified spherical Bessel function of the first kind.
sourceraw docstring

spherical-bessel-2-i0clj

(spherical-bessel-2-i0 x)

Second modified spherical Bessel function of the first kind and order 0.

Second modified spherical Bessel function of the first kind and order 0.
sourceraw docstring

spherical-bessel-2-i1clj

(spherical-bessel-2-i1 x)

Second modified spherical Bessel function of the first kind and order 1.

Second modified spherical Bessel function of the first kind and order 1.
sourceraw docstring

spherical-bessel-2-i2clj

(spherical-bessel-2-i2 x)

Second modified spherical Bessel function of the first kind and order 2.

Second modified spherical Bessel function of the first kind and order 2.
sourceraw docstring

spherical-bessel-jclj

(spherical-bessel-j order x)

Spherical Bessel function of the first kind.

Spherical Bessel function of the first kind.
sourceraw docstring

spherical-bessel-j0clj

(spherical-bessel-j0 x)

Spherical Bessel function of the first kind and order 0.

Spherical Bessel function of the first kind and order 0.
sourceraw docstring

spherical-bessel-j1clj

(spherical-bessel-j1 x)

Spherical Bessel function of the first kind and order 1.

Spherical Bessel function of the first kind and order 1.
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spherical-bessel-j2clj

(spherical-bessel-j2 x)

Spherical Bessel function of the first kind and order 2.

Spherical Bessel function of the first kind and order 2.
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spherical-bessel-kclj

(spherical-bessel-k order x)

Modified spherical Bessel function of the second kind.

Modified spherical Bessel function of the second kind.
sourceraw docstring

spherical-bessel-k0clj

(spherical-bessel-k0 x)

Modified spherical Bessel function of the second kind and order 0.

Modified spherical Bessel function of the second kind and order 0.
sourceraw docstring

spherical-bessel-k1clj

(spherical-bessel-k1 x)

Modified spherical Bessel function of the second kind and order 1.

Modified spherical Bessel function of the second kind and order 1.
sourceraw docstring

spherical-bessel-k2clj

(spherical-bessel-k2 x)

Modified spherical Bessel function of the second kind and order 2.

Modified spherical Bessel function of the second kind and order 2.
sourceraw docstring

spherical-bessel-yclj

(spherical-bessel-y order x)

Spherical Bessel function of the second kind.

Spherical Bessel function of the second kind.
sourceraw docstring

spherical-bessel-y0clj

(spherical-bessel-y0 x)

Spherical Bessel function of the second kind and order 0.

Spherical Bessel function of the second kind and order 0.
sourceraw docstring

spherical-bessel-y1clj

(spherical-bessel-y1 x)

Spherical Bessel function of the second kind and order 1.

Spherical Bessel function of the second kind and order 1.
sourceraw docstring

spherical-bessel-y2clj

(spherical-bessel-y2 x)

Spherical Bessel function of the second kind and order 2.

Spherical Bessel function of the second kind and order 2.
sourceraw docstring

tricomis-Uclj

(tricomis-U a b x)

Confluent hypergeometric function U of the second kind.

Confluent hypergeometric function U of the second kind.
sourceraw docstring

trigammaclj

(trigamma x)

Second derivative of log of Gamma function.

Second derivative of log of Gamma function.
sourceraw docstring

upper-incomplete-gammaclj

(upper-incomplete-gamma s x)

Upper incomplete gamma function

Upper incomplete gamma function
sourceraw docstring

whittaker-Mclj

(whittaker-M kappa mu x)

Whittaker's M

Whittaker's M
sourceraw docstring

whittaker-Wclj

(whittaker-W kappa mu x)

Whittaker's W

Whittaker's W
sourceraw docstring

xiclj

(xi s)

Riemann (Landau's) Xi function

Riemann (Landau's) Xi function
sourceraw docstring

zetaclj

(zeta s)
(zeta s z)

Riemann and Hurwitz zeta functions for real arguments

Riemann and Hurwitz zeta functions for real arguments
sourceraw docstring

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