# How to plot polynomial in matlab

3 views (last 30 days)
Commented: Dyuman Joshi on 3 Mar 2024
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
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 on 3 Mar 2024
You need to use element-wise power - power, .^
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;

Alexander on 29 Feb 2024
Edited: Alexander on 29 Feb 2024
Some homework assistance and solution:
x = linspace(0,0.8,1000);
y = 150*x - 400*x.^2 + 500*x.^3;
plot(x,y)
Dyuman Joshi on 29 Feb 2024
Edited: Dyuman Joshi on 29 Feb 2024
I believe that's solving the problem rather than assisting.

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