hi every one i need series for erfc(x) match with it in plot

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sura
sura 2022-9-22
评论： Torsten 2022-9-22
i need correct series for the equation of erfc(x) and maching with it in plot
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sura
sura 2022-9-22
there are series representation. taylor series is series expansion. in wolfarm website you can write series erfc(x). you will find three or more series representation.
i need one of these match with it with function by k not x

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Sam Chak
Sam Chak 2022-9-22
Ran in:
Hi @sura
Are you looking for something like this?
syms x
sympref('PolynomialDisplayStyle', 'ascend');
f = erfc(x); % function
T = taylor(f, 'Order', 8) % Taylor series
T = 
xd = -2:0.1:2;
yd = subs(f, x, xd);
fplot(T, [-2, 2])
hold on
plot(xd, yd, 'r-.'), grid on
title('Taylor approximation vs. actual function')
legend('Taylor','Function')
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Torsten
Torsten 2022-9-22
If you had studies Sam Chak's answer, you would have seen that your series expansion is just the one that he used for the plot.

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