a)
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function result = simpsons(a,b,n,f)
if mod(n, 2) ~= 0
error('Parameteren n må være et partall, var %d\n', n);
end
dx = (b-a)/n;
y= f(a:dx:b);
yodd = 2*sum(y(3:2:n-1));
yeven = 4*sum(y(2:2:n));
ysum = y(1) + yodd + yeven + y(n+1);
result = dx/3 * ysum;
end |
b)
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function result = simpsons_error(start, stop, error, fn)
N = 2; % N må være et partall
Si = simpsons(start, stop, N, fn);
S2i = simpsons(start, stop, 2*N, fn);
while abs(Si-S2i) >= error
N = 2 * N;
Si = S2i;
S2i = simpsons(start, stop, 2*N, fn);
end
fprintf('Antal ledd: %d\n', N);
result = Si;
end |