How to make this plot smoother?

Question

Ellen De Jonghe 2020-1-14

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回答： Ellen De Jonghe 2020-1-14

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Hye, I have to replicate the following plots (it's homework).

I have to use fplot and an anonymous function for the left one and plot for the right one.

I made this script:

subplot(1,2,1) %eerste subplot, 1 rij 2 kolommen
f = @(x) sin(5.*x)./x-cos(x./3); %Anonieme functie
fplot(f, [-5,5])%fplot, interval meegeven
title('sin(5t)/t - cos(t/3)')
xlabel('t')
ylabel('y(t)')
subplot(1,2,2) %tweede subplot
a = 1/4;
b = 4;
x = linspace(0,4,10^8); %punten tussen 0 en 4
y = (b./x).*exp(-(log(x)./a).^2);
plot(x,y) %Plot met blauwe volle lijn
axis([0, 4, 0, 5])
title('(b/x)e^{ln(x)/a^{2}}')
xlabel('x')
ylabel('f(x)')
legend('(a,b) = (1/4,4)', 'Location', 'north')