Vectors must be the same length.

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shiv gaur 2022-1-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1637255-vectors-must-be-the-same-length

评论： Rik 2022-1-27

theta=30:0.01:50;

lambda=633;

k0=2*pi/lambda;

e1=1.50^2;e3=1.33^2;e2=(0.12+1i*3.5)^2;

n1=1.50;n3=1.33;n2=0.12+1i*3.433;

d2=50;

n1=1.50;

x=n1*sind(theta);

k1=k0.*sqrt(e1.*mu1-x.^2);

k2=k0.*sqrt(e2.*mu2-x.^2);

k3=k0.*sqrt(e3.*mu3-x.^2);

q1=sqrt(e1-x.^2)./e1;

q2=sqrt(e2-x.^2)./e2;

q3=sqrt(e3-x.^2)./e3;

p=k2.*d2;

m111=cosd(p);

m112=-1i.*sind(p)./q2;

m121=-1i*q2.*sind(p);

m122=cosd(p);

Mtot=zeros(1,length(theta));

for j=1:length(theta)

M1=[m111(1,j),m112(1,j);m121(1,j),m122(1,j)];

Mtot=M1;

R(j) =((Mtot(1,1) +Mtot(1,2).*q3).*q1-Mtot(2,1) -Mtot(2,2).*q3)/(((Mtot(1,1) +Mtot(1,2).*q3).*q1+Mtot(2,1) +Mtot(2,2).*q3)).^2;

end

figure(1);

plot(theta,abs(R));

xlabel('incident angle');

ylabel('transmmission, s-pol');

plot is not showing any value error

Vectors must be the same length. pl help to plot

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shiv gaur 2022-1-27

编辑：Rik 2022-1-27

在 MATLAB Online 中打开

r plot.fig

without looping graph look like that but not rigt value of r is not greater than one file att

theta=40:80;
lambda=633;
k0=2*pi/lambda;
e1=1.50^2;e3=1.33^2;e2=(0.12+1i*3.5)^2;
n1=1.50;n3=1.33;n2=0.12+1i*3.433;
d2=50;
n1=1.50;
x=n1*sind(theta);
k1=k0.*sqrt(e1.*mu1-x.^2);
Unrecognized function or variable 'mu1'.
k2=k0.*sqrt(e2.*mu2-x.^2);
k3=k0.*sqrt(e3.*mu3-x.^2);
q1=sqrt(e1-x.^2)./e1;
q2=sqrt(e2-x.^2)./e2;
q3=sqrt(e3-x.^2)./e3;
p=k2.*d2;
m111=cosd(p);
m112=-1i.*sind(p)./q2;
m121=-1i*q2.*sind(p);
m122=cosd(p);
disp(m111)
%5Mtot=zeros(length(theta));
%R=zeros(length(theta));
%for j=1:length(theta)
%M1=[m111(1,j),m112(1,j);m121(1,j),m122(1,j)];
%Mtot=M1;
R=((m111 +m112.*q3).*q1-m121 -m122.*q3)./(((m111 +m112.*q3).*q1+m121 +m122.*q3)).^2;       
%end
%R(j) =((Mtot(1,1) +Mtot(1,2).*q3).*q1-Mtot(2,1) -Mtot(2,2).*q3)/(((Mtot(1,1) +Mtot(1,2).*q3).*q1+Mtot(2,1) +Mtot(2,2).*q3)).^2;       
%end
figure(1);
plot(theta,abs(R));
xlabel('incident angle');
ylabel('transmmission, s-pol');

but using loop there is problem pl help

Rik 2022-1-27

Have a read here and here. It will greatly improve your chances of getting an answer.

Please try to avoid duplicate posts.

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回答（1 个）

Walter Roberson 2022-1-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1637255-vectors-must-be-the-same-length#answer_882850

Is it possible that you ran this code twice with more theta values the first time? You are not preallocating R so if you ran multiple times R would exist with the previous size.

It would be a good idea to preallocate R in your code.