plot of y = 2.*(x.^4 - x.^2) isn't right

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Anna
Anna on 27 Mar 2022
Commented: Anna on 27 Mar 2022
I set x = linspace(-10, 10); y = 2.*(x.^4 - x.^2); plot(x, y)
and the graph is not correct. what did I do wrong?
  3 Comments
DGM
DGM on 27 Mar 2022
Seems fine to me.
x = linspace(-10, 10);
y = 2.*(x.^4 - x.^2);
plot(x, y)
It might be that you're working in a figure that's already had hold on set, and the axis extents are such that the curve is not visible. If that's the case, either clear the figure (clf) or set the axis limits to something appropriate (use xlim() or ylim())

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Answers (1)

Dave B
Dave B on 27 Mar 2022
I'm pretty sure that's correct, were you expecting to see more of a w-like shape? You might have to zoom in a bit for that (and it helps to add some more points:
tiledlayout(1,2)
nexttile
x = linspace(-10, 10);
y = 2*(x.^4 - x.^2);
plot(x, y)
title('default limits')
nexttile
x = linspace(-10, 10, 1000);
y = 2*(x.^4 - x.^2);
plot(x, y)
ylim([-1 6])
title('more points, zoomed in')
  1 Comment
Anna
Anna on 27 Mar 2022
Yes expecting a w shape. Thanks!

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