Can someone please help! I cannot plot this graph.

x=[-0.1:0.1];
y=35000000*x+401000./x-17122.7./x.^2-1494500;
figure
plot(x,y)
legend('y')

I think my function is correct, but the graph is blank and no line shows up. Please help. Thank you!

Answer 1

[Chunru]

x=[-0.1:.001:0.1]+eps;  % your original x has only 1 point without the step.  
% In addition, x can be zeros abd the y is not defined for x=0.
% Here we plot the data.  However, you should check the formula
y=35000000*x+401000./x-17122.7./x.^2-1494500;
figure
plot(x,y)
%ylim([-100 100])
legend('y')

[Tianlan Yang]

Thank you so much!

Answer 2

[Image Analyst]

Because your x has only one value in it. Try using linspace() and specifying the number of elements you want in x:

x = linspace(-0.1, 0.1, 2000);
y = 35000000*x + 401000./x - 17122.7./x.^2 - 1494500;
plot(x,y, 'b-', 'LineWidth', 2);
grid on;
legend('y')

[Tianlan Yang]

Thank you!