what could be causing matrix dimensions must agree error

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justin stephens 2019-1-13

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https://ww2.mathworks.cn/matlabcentral/answers/439597-what-could-be-causing-matrix-dimensions-must-agree-error

评论： Star Strider 2019-1-13

I am trying to plot the gain as a function of frequency. i am trying to vary the frequency from 1 to 1E6, this is so i gan have a frequency range. This is not necessarily needed to solve my problem though. I am getting this error "Error using " / " Matrix dimensions must agree." at line 7 for this segment of code. Its nothing complicated i am just sure that i am doing something incorrect. I have commented out the other way i was going to go about this. so that can be ignored.

clear;
%for i from 0 to 1E8;
   % f [i]= i;
c = 3^8;   
frequency = 1:100:10^6;
lambda = c/frequency;
area = .1^2;    
gain = (((4*pi)/lambda^2)/(area));
subplot (1,1,1)
plot (frequency,gain)
grid on

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Answer 1

Star Strider 2019-1-13

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https://ww2.mathworks.cn/matlabcentral/answers/439597-what-could-be-causing-matrix-dimensions-must-agree-error#answer_356242

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You need to use element-wise operations (the ‘dot operator’) in the exponentiation and division, in your lambda and gain calculations.

This works:

c = 3^8;   
frequency = 1:100:10^6;
lambda = c./frequency;
area = .1^2;    
gain = (((4*pi)./lambda.^2)/(area));
subplot (1,1,1)
plot (frequency,gain)
grid on