log plot in matlab

12 次查看（过去 30 天）
Diego Concha Fernandez
Hello,
I am trying to plot a log function.
So , i first calculate the integral of a function.
Second, make a simpson approximation,
Third , calculate the error between the integral and each approximation from n = 2 to n= 100000;
And fourth I try to plot a log graph having the x axis : n from 2 to 100000 , and its corresponding error on the y axis... However, the graph its not plotting any results, can anyone please help me out with this?
1)
function [I] = actualintegral(x)
fun = @(x) exp(-x.^2);
xmin=0;
xmax=1;
I= integral(fun,xmin,xmax);
end
...
2)
function[S] = simpson(n)
f=@ (x)exp(-x^2);
a= 0 ;
b= 1;
h = (b-a)/n;
g = f(a)+f(b);
for i = 1:2:n-1
g=g+4*f(a+i*h);
end
for i= 2:2:n-2
g= g+2*f(a+i*h);
end
S =h/3 * g;
end
...
3)
function [error] = errort(I,S,n)
I = actualintegral();
for n=2:100:100000
S = simpson (n);
error = abs(I - S)
end
end
...
4)
function [P] = logplot(I,S,n)
x = logspace(0,4);
y = errort ();
loglog(x,y,'-s')
grid on
end

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