Code error with parameter

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Ellen Brown 2020-1-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/498859-code-error-with-parameter

评论： Star Strider 2020-1-4

采纳的回答： Star Strider

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I'm trying to adapt my code below

rg = 0.01;
rl = 0.01;
s1 = [-1:0.000001:5];
x = ((s1-rg-rl)+sqrt((rg+rl-s1).^2+4.*s1.*rg))./(2.*s1);

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Star Strider 2020-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/498859-code-error-with-parameter#answer_408619

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I am not certain what you want, however it most likely depends on how you define ‘t’.

Example —

rg = 0.01;
rl = 0.01;
s1 = [-1:0.000001:5];
x = ((s1-rg-rl)+sqrt((rg+rl-s1).^2+4.*s1.*rg))./(2.*s1);
t1 = 0:numel(s1)-1;                                             % Define ‘t1’, Interval = 1 sec
t2 = (0:numel(s1)-1)*5;                                         % Define ‘t2’, Interval = 5 sec
figure
plot(t1, x)
hold on
plot(t2, x)
hold off
grid
legend('\Delta t = 1 s', '\Delta t = 5 s', 'Location','E')

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Ellen Brown 2020-1-4

That's exactly what I want! Thank you so much! I'm being a bit cheeky now but how would I get a vector of those s_val values? I'd like to plot xs against the s_val values

Star Strider 2020-1-4

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As always, my pleasure!

Not cheeky at all! That’s a perfectly legitimate question.

To store the ‘s_val’ values (without re-writing the rest of the loop):

xs = zeros(size(U));
s_val_vct = xs;
for k = 1: numel(U)
    s_val = s1(k)*(rem(k,2)==0) + s2(k)*(rem(k,2)==1);      % Even-Odd Values of ‘k’ Select ‘s’
    xs(k) = x(s_val);
    s_val_vct(k) = s_val;
end

Then to plot them:

figure
plot(s_val_vct, xs, 'p')
grid
xlabel('s')
ylabel('x')

It’s best to plot them with markers, unlless you want to use the sort function to sort ‘xs’ and ‘s_val_vct’ and then plot with lines, because ‘s_val’ alternates between poisitive and negative values, and that would create a confusing and disordered plot. (I like plotting with pentagrams. Choose the marker you want.)

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