Why does the MATLAB plot show up with no function on it?

figure()

x = linspace(0,1000);

y1 = (sqrt(2)*sqrt(x.^4 + 9)) ./ (2*x.^2);

plot(x,y1)

xlim([1,2])

ylim([0.8,2])

Answer 1

[Jon]

Your plot limits are outside of the range of the data.

Also you don't have enough (or any data points) in the range of x that you are plotting.

If you truly want to plot for x between 1 and 2 try

figure()
x = linspace(1,2); % just range of interest
y1 = (sqrt(2)*sqrt(x.^4 + 9)) ./ (2*x.^2);
plot(x,y1)
xlim([1,2])
ylim([0.8,2]) 

[Jon]

Note that in your original code

x = linspace(0,1000)

Will generate 50 points (default) between 0 and 1000. This means that your first point is at 0 and the next point is at 10.101, so you didn't have any data at all for x between 1 and 2 which is what your plot limits were set to

[Liam Reid]

Thanks Jon I think I just figured it out!

[Jon]

Please accept this answer if it solved your problem