Plotting using a for loop

alexrecai

2021 3 19

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Hello, I'm having a difficulty plotting the results using a for loop. I want to plot epsilon vs sigma but I get the following error: Array indices must be positive integers or logical values. Can you please help me? Thank you.

E=200*10^9; %Pa Elastic Modulus

v= 0.28; %Poisson's Ratio

eps=linspace(0,0.1,1000);

Y= 375.8;

m=2000;

n=0.5;

for i= 1:1000

sigma(i)=Y(1+m*eps(i)^n)

end

eps=[0 eps];

plot(eps,sigma)

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Alan Stevens 2021-3-19

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Like so:

E=200*10^9; %Pa Elastic Modulus
v= 0.28; %Poisson's Ratio
eps=linspace(0,0.1,1000);
Y= 375.8;
m=2000;
n=0.5;
for i= 1:1000
sigma(i)=Y*(1+m*eps(i)^n);  % You need a multiply sign between Y and what follows it.
end
% eps=[0 eps];  You don't need this.
plot(eps,sigma)