i need series representation for the equation of erfc(x) and maching with it in plot
조회 수: 1 (최근 30일)
이전 댓글 표시
i need series representation for the equation of erfc(x) and maching with it in plot. there are series representation. taylor series is series expansion. in wolfram website (www.wolframalpha.com) you can write series erfc(x). you will find three or more series representation. i need one of these match with erfc(x) with function by k not x. like equation imges below (which one is good for matching plot figure )
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1133710/image.gif)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1133715/image.gif)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1133720/image.gif)
댓글 수: 0
채택된 답변
Chunru
2022년 9월 23일
x = 0.5;
format long
erfc(x)
for n=1:20
y(n) = erfc_by_series(x, n);
end
y'
function y= erfc_by_series(x, n)
t = x; % term inside sum for k=0
s = t;
for k=1:n
t = -t*x.^2/k;
s = s + t/(2*k+1);
end
y = 1 - 2/sqrt(pi)*s;
end
댓글 수: 16
Torsten
2022년 9월 24일
erfc(x) is 1 - 2/sqrt(pi)*s.
Or didn't you look at what you posted as the first representation of erfc(x) ?
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Error Functions에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!