plotting multiple coefficients of polynomial function

Question

Shane Palmer 2020-6-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/551956-plotting-multiple-coefficients-of-polynomial-function

回答： Shane Palmer 2020-6-20

Hello,

I have tried to follow the suggested examples for plotting multiple graphs on one figure of the same function with different coefficients.

I've been unsuccessful in my attempts. I am trying to model my function of omega and eta, but with multiple k values.

I started off trying to setup a for loop, but did not get that to work for me.

I tried to just define my k value multiple times and use the "hold on" command, but the graph just maintained the last value of k and excluded the previous k values.

I know I am missing something simple here, but I am not seeing it.

Here is my code:

syms omega__norm 
k = 0.8;
eta__H = omega__norm*k.^2/(omega__norm.^2*(1-k.^2)+1)
fplot(omega__norm,eta__H,[10^-2 10^2])
set(gca,'Xscale','log')
hold off

Again, I would like setup k as a vector of values and plot all of the resulting graphs on a single figure.

Just not seeing how I need to do that properly.

Thank you for your help in advance!

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Shane Palmer 2020-6-20

在 MATLAB Online 中打开

Oh, just figured it out. I needed a for loop like this:

syms omega__norm 
for k = 0.5:0.05:0.9
eta__H = omega__norm*k.^2/(omega__norm.^2*(1-k.^2)+1)
fplot(omega__norm,eta__H,[10^-2 10^2])
hold on
end
set(gca,'Xscale','log')
hold off