how can I plot a summation correctly?

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Asecern 2019-4-16

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评论： Celsa Pachlhofer 2020-4-21

It is asked that summation k=0 to the n ,1/(k^2+1) and n is an input variable. It is also asked the S versus k graph. I wrote a code like:

n=input('enter the n value')
S=0;
for k=1:0.1:n
    S = S + 1/(k^2+1)
end
hold on
plot(S,k,'--ro')

The summation is correctly calculated by the n value given but I am not getting the plot result. It only gives the final summation value as a dot. What should I do to have a proper graph?

Thank you so much!

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采纳的回答

Torsten 2019-4-17

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n = 10;
k = 0:n;
S = cumsum(1./(k.^2+1));
plot(k,S)

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Asecern 2019-4-17

thanks for teaching the ''cumsum''.

Celsa Pachlhofer 2020-4-21

Worked for me ploting Leibniz series, thanx!

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