Question

I’m stumped. What is going on with MATLAB’s syntax?

clear all;

dx = .1;
x=-2:dx:2;
f=zeros(length(x),1);
int_f=zeros(length(x),1);
for n=1:length(x)
    f(n)=x(n).^2;
    int_f(n) = f(n)*dx+int_f(n);
end
plot(x,int_f(n));

Answer 1

I think you should be plotting that using plot(x,int_f); that way you plot the two arrays rather than one array against one single number.

Also your integral step is wrong, it should be int_f(n) = f(n)*dx+int_f(n-1) except for the first run, where it should be int_f(n) = f(n)*dx