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# Error Function Complex

## Contents

Princeton, NJ: Princeton University Press, p.105, 2003. Erf is the "error function" encountered in integrating the normal distribution (which is a normalized form of the Gaussian function). Sloane, N.J.A. Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. get redirected here

This, however, is of little importance, as this is the limit of what double precision, floating-point computation provides. Is it unreasonable to push back on this? The error function is related to the cumulative distribution Φ {\displaystyle \Phi } , the integral of the standard normal distribution, by[2] Φ ( x ) = 1 2 + 1 Create "gold" from lead (or other substances) Draw an ASCII chess board! http://mathworld.wolfram.com/Erf.html

## Error Function Complex

The system returned: (22) Invalid argument The remote host or network may be down. Referenced on Wolfram|Alpha: Erf CITE THIS AS: Weisstein, Eric W. "Erf." From MathWorld--A Wolfram Web Resource. At the imaginary axis, it tends to ±i∞. p.297.

share|cite|improve this answer answered Mar 14 '14 at 19:28 GEdgar 46.9k153133 This might work, thanks –Sleepyhead Mar 14 '14 at 20:33 add a comment| up vote 1 down vote ERF overloads the default MATLAB error function of real-valued numbers with a much faster implementation. Thus, I have implemented a simple while loop to achieve a desired precision. Error Function Complex Argument Continued fraction expansion A continued fraction expansion of the complementary error function is:[11] erfc ⁡ ( z ) = z π e − z 2 1 z 2 + a 1

These generalised functions can equivalently be expressed for x>0 using the Gamma function and incomplete Gamma function: E n ( x ) = 1 π Γ ( n ) ( Γ Faddeeva Function When must I use #!/bin/bash and when #!/bin/sh? New York: Chelsea, 1948. Hopefully using your comment and comment from GEdgar, I can get to something –Sleepyhead Mar 14 '14 at 21:34 @Sleepyhead: wow, OK good luck.

The defining integral cannot be evaluated in closed form in terms of elementary functions, but by expanding the integrand e−z2 into its Maclaurin series and integrating term by term, one obtains Complex Gamma Function MathCAD provides both erf(x) and erfc(x) for real arguments. http://mathworld.wolfram.com/Erf.html Wolfram Web Resources Mathematica» The #1 tool for creating Demonstrations and anything technical. Acton, F.S.

• See http://ab-initio.mit.edu/Faddeeva for an alternative (free/open-source) function that is a compiled MEX plugin (hence running several times faster than this code) which achieves around 13 digits of accuracy or more in
• For , may be computed from (9) (10) (OEIS A000079 and A001147; Acton 1990).
• LCCN64-60036.
• Applications When the results of a series of measurements are described by a normal distribution with standard deviation σ {\displaystyle \textstyle \sigma } and expected value 0, then erf ( a

Level of Im(ƒ)=0 is shown with a thick green line. ERFZ can replace ERF if no error message is required when called with complex numbers. Error Function Complex Using the alternate value a≈0.147 reduces the maximum error to about 0.00012.[12] This approximation can also be inverted to calculate the inverse error function: erf − 1 ⁡ ( x ) Imaginary Error Function Ramanujan: Twelve Lectures on Subjects Suggested by His Life and Work, 3rd ed.

thanks, very helpful! http://invictanetworks.net/error-function/error-function-calculator.html Wolfram Demonstrations Project» Explore thousands of free applications across science, mathematics, engineering, technology, business, art, finance, social sciences, and more. A complex generalization of is defined as (39) (40) Integral representations valid only in the upper half-plane are given by (41) (42) SEE ALSO: Dawson's Integral, Erfc, Erfi, Fresnel Integrals, Gaussian Read through the derivation. –Ron Gordon Mar 14 '14 at 21:30 Oh, my bad. =) ${}{}$ –Pedro Tamaroff♦ Mar 14 '14 at 21:30 I am bookmarking your Complex Error Function C++

Julia: Includes erf and erfc for real and complex arguments. See also Related functions Gaussian integral, over the whole real line Gaussian function, derivative Dawson function, renormalized imaginary error function Goodwin–Staton integral In probability Normal distribution Normal cumulative distribution function, a Applied Mathematics Series. 55 (Ninth reprint with additional corrections of tenth original printing with corrections (December 1972); first ed.). useful reference New York: Gordon and Breach, 1990.

Conf., vol. 2, pp. 571–575. ^ Van Zeghbroeck, Bart; Principles of Semiconductor Devices, University of Colorado, 2011. [1] ^ Wolfram MathWorld ^ H. Error Function Values Generated Tue, 11 Oct 2016 14:42:02 GMT by s_wx1131 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.9/ Connection A simple integral involving erf that Wolfram Language cannot do is given by (30) (M.R.D'Orsogna, pers.

## The imaginary error function has a very similar Maclaurin series, which is: erfi ⁡ ( z ) = 2 π ∑ n = 0 ∞ z 2 n + 1 n

Related 1Using residue theorem separately for real and imaginary parts4Separate incomplete elliptic integral into real and imaginary parts1Function of a complex variable; must the real and imaginary parts be functions of When should I refuel my vehicle? ContourPlot[-Log[10, Abs[g[x, y, 0.5]/(Erf[x + I y] + 10^(-16)) - 1]], {x, -2, 2}, {y, -4, 4}, PlotPoints -> 20, PlotLegends -> Automatic] The high amount of detail is indicative of Complex Normal Distribution How?