help!! Error:In an assignment A(I) = B, the number of elements in B and I must be the same.

Question

sharif shikder 2016-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/265983-help-error-in-an-assignment-a-i-b-the-number-of-elements-in-b-and-i-must-be-the-same

回答： Star Strider 2016-2-1

clear all;
close all;
L_0=10;  %Average outer scale of turbulance in m.
c_n=5*10^(-12);  %Structure constant of refractive index in m^-2/3.
c=300000000; % Speed of light in m/s.
f=20*10^9; % Frequency in HZ.
lamda=c/f; 
L=100:100:5000;%Equivalent Path length through the turbulence area
 %del_ky=0.01;
 for i=length(L) 
   sigma(i)=((0.307*(c_n)^2)*((2*3.1416/lamda)^(1.17))*(L.^(1.833)))-((0.742*(c_n)^2)*((2*23.1416/lamda)^(0.17))*((L.^(2.833))*(L_0^2)))
   end
semilogy(sigma,L)

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Answer 1

Star Strider 2016-2-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/265983-help-error-in-an-assignment-a-i-b-the-number-of-elements-in-b-and-i-must-be-the-same#answer_208038

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You can do this using ‘vectorised’ code without the loop:

L_0=10;  %Average outer scale of turbulance in m.
c_n=5*10^(-12);  %Structure constant of refractive index in m^-2/3.
c=300000000; % Speed of light in m/s.
f=20*10^9; % Frequency in HZ.
lamda=c/f; 
L=100:100:5000;%Equivalent Path length through the turbulence area
 %del_ky=0.01;
sigma = ((0.307*(c_n)^2)*((2*3.1416/lamda)^(1.17))*(L.^(1.833)))-((0.742*(c_n)^2)*((2*23.1416/lamda)^(0.17))*((L.^(2.833))*(L_0^2)));
semilogy(sigma,L)