Ignoring extra legend entries?

My function is supposed to graph all three values of y against x, but instead it graphs the first two and I receive the error notice: Warning: Ignoring extra legend entries. How can I resolve this? My code is below:

X = -10:0.2:10; y1 = X.^2; y2 = X.*cos(X) y3 = -X.^3 plot(x,y1,y2,y3);

%set the domain and range axis([-10 10 -10 10]);

title('Comparing functions') xlabel('x') ylabel('y') legend('y1=x^2','y2=xcos(x)','y3=-x^3')

print('module04.png','-dpng')

Answer 1

[David Goodmanson]

Hello Charlotte, you should be getting a pretty strange graph right now, since it would be plotting x vs y1 and then y2 vs y3. try

plot(X,[y1;y2;y3]);

which creates a matrix of y arrays and uses the X array as the independent variable all three times.

[Charlotte Davies]

Thank you! Haha whoops no wonder it was looking so strange...