How to plot polynomial in matlab

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Madison
Madison 2024-2-29
评论： Dyuman Joshi 2024-3-3
equation is f(x) = 150x - 400x^2 + 500x^3
Want to plot f(x) for x= 0 to 0.8
need to have a legend
  4 个评论
显示 2更早的评论
Madison
Madison 2024-3-3
I have tried the following - Getting an error on line 5
epsilon = linspace(0,0.8,100);
sigma = zeros(1,100);
i = 1:length(epsilon);
strain = epsilon(i);
stress = 150*strain - 400*strain^2 + 500*strain^3;
sigma(i) = stress;
figure;
plot (epsilon, sigma)
xlabel('Strain(ε)');
ylabel('Stress(σ)(kPa)');
title('Stress/Strain for Foam');
grid on;
Dyuman Joshi
Dyuman Joshi 2024-3-3
Ran in:
You need to use element-wise power - power, .^
See - Array vs Matrix Operations
epsilon = linspace(0,0.8,100);
sigma = 150*epsilon - 400*epsilon.^2 + 500*epsilon.^3;
figure;
plot (epsilon, sigma)
xlabel('Strain(ε)');
ylabel('Stress(σ)(kPa)');
title('Stress/Strain for Foam');
grid on;

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回答（1 个）

Alexander
Alexander 2024-2-29
编辑：Alexander 2024-2-29
Some homework assistance and solution:
x = linspace(0,0.8,1000);
y = 150*x - 400*x.^2 + 500*x.^3;
plot(x,y)
  1 个评论
Dyuman Joshi
Dyuman Joshi 2024-2-29
编辑：Dyuman Joshi 2024-2-29
I believe that's solving the problem rather than assisting.
I suggest you edit your answer accordingly.

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