How can I connect the dots in my plot?

Basically if I plot it 'x' it looks fine but if I plot '--' the lines connect in crazy pattern. What can I do?

Its really annoying me. I know that I can sort the data to match up with the correct points but to be honest I'm not sure how to do that.

please find attached source files and data,

Answer 1

[Star Strider]

Another approach:

D = load('Dustin Braun PL0Data (6).mat');
x = D.x;
y = D.y;

A = [x.^3 ones(size(x))];
p = A\y;

x1 = linspace(min(x), max(x))';
y1 = [x1.^3  ones(size(x1))]*p;

figure(1)
plot(x, y, 'o', x1, y1, '-r')
grid

[Dustin Braun]

Awesome you're the best!

[Star Strider]

Thank you!

Answer 2

[Walter Roberson]

[xs, xidx] = sort(x);
ys = y(xidx);
plot(xs, ys)

[Dustin Braun]

I'm not really sure how this helps me. Could you please explain.