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How to plot graph of Simpson's rule and Trapezoidal rule between error and n?

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Nobita Nobi
Nobita Nobi 2020-12-12
回答： skerdi hymeraj 2021-10-3
Hi there,
I have written 2 programs of Simpson's rule and Trapezoidal rule to compute the integral of a function f. Now I would like to plot graphs of both rules between the errors and n but I don't know how to do it. Could anyone help me with this problem please?
Here is the code of my program:
a=0.1;
b=0.2;
n=30;
x=linspace(a,b,n);
h=(b-a)/n;
f=inline('x.^4-x.*5+1');
y=x.^4-x.*5+1;
H=h*ones(1,n); %trapezoid
H([1,n])=h/2;
tr=sum (H.*f(x));
tr
H(1:2:n)=2*h/3; %simpson
H(2:2:n)=4*h/3;
H([1,n])=h/3;
simp=sum(H.*f(x));
simp
Thank you in advance!

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回答（2 个）

Alan Stevens
Alan Stevens 2020-12-13
If you use cumsum instead of just sum then you can plot tr and simp against x.
skerdi hymeraj
skerdi hymeraj 2021-10-3
where is ploting

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