Vectors must be the same length.

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mohammad heydari 2019-11-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/489978-vectors-must-be-the-same-length

编辑： mohammad heydari 2019-11-9

采纳的回答： M

Hi there.I want to draw the following formula, but I get the following error

error: Vectors must be the same length.

why?

y(t) is a 41765*4 matrix and A=y(:,3).

for example y(:,3) having values as follows:

8.26665517322484e-08 - 3.08466436225798e-07i

2.94822110031966e-08 - 1.28642078260667e-07i

4.87811541654193e-08 + 1.34459400745398e-08i

5.20060276867161e-08 - 1.37015907821914e-07i

7.13757345297127e-08 - 2.06148057224859e-07i

8.21435079828878e-08 - 1.73652495134914e-07i

...

And my code in Matlab

tspan = [0 2e-9];                   % time interval, up to 2 ns
y0 = [0+eps,0+eps,0+eps,0+eps];     
[t,y] = ode45(@rate_eq_program_1,tspan,y0);
size(t);
t=t*1e9;
y = abs(y);                                         % Change As Necessary To Get The Desired Resullt
delta_omega_laser=diff(atan(real(y(:,3))./imag(y(:,3))));
figure(1)
g = plot(t,delta_omega_laser );   % divided to normalize
xlabel('time [ns]','FontSize',14);  % size of x label
ylabel('Arbitrary units','FontSize',14);    % size of y label
set(gca,'FontSize',14);                 % size of tick marks on both axis
legend('\delta_omega', 'Location','SE')  % legend inside the plot

Thanks in advance for helping!!

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darova 2019-11-8

diff is just difference between values:

dy(1) = y(2) - y(1);
dy(2) = y(3) - y(2);
%...

If you have 5 elements in y arrays. How many would you have in dy?

mohammad heydari 2019-11-8

I mean derivation and implementation of formulas, not differences.y are calculated in ode and i want to calculate formulas.

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采纳的回答

M 2019-11-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/489978-vectors-must-be-the-same-length#answer_400527

What lines causes the error ? Following one ?

g = plot(t,delta_omega_laser );

t and delta_omega_laser must have the same length.

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darova 2019-11-9

Try:

ylim([-1 1]*2e-7)

I don't know why you don't get the graph you want. I think the problem is deeper than it seems

Results make more sense if plot like this:

plot(real(y(:,3)),imag(y(:,3)),'.-b')

mohammad heydari 2019-11-9

编辑：mohammad heydari 2019-11-9

thanks alot for your help.

Trying to check again.

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