How do I get my loglog plot to chose the correct interval?

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Marcus
Marcus 2015-2-13
评论： Geoff Hayes 2015-2-15
Hi, I'm trying to get a loglog plot to show the correct interval. The code is meant to show numerical derivation of sin(x), here is my code:
f = @(x) sin(x);
g = @(x) cos(x);
for i = 1:10
h(i,:) = 10^(-i);
end
x=1;
df = (f(x+h)-f(x))./h;
fel = abs(g(1)-df);
[df fel h];
figure(1)
hold on
loglog(h, fel)
grid on
xlabel('h')
ylabel('Fel')
When I plot it the plot only shows h and fel from 0 to 0.1. The interesting interval is from 10^-1 to 10^-10 for h and 10^-1 to 10^-8 for fel. How do I get the loglog plot to show this intervall, or at least any interval close enough? Thank you for any help.
  1 个评论
Geoff Hayes
Geoff Hayes 2015-2-15
Marcus - you could try xlim and ylim to set the x- and y-axis intervals. But (10^-10,10^-1) for the x-axis is not much different from what you have now. Are you sure that there will be something interesting to show there?

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