Problem with plotting a basic function with a domain specified by an array or vector...

Question

Stan 2013-4-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/70064-problem-with-plotting-a-basic-function-with-a-domain-specified-by-an-array-or-vector

Hi, im new to matlab. Im having trouble with the following code. I have to do a plot of "gamma" in the end, but I get an error message saying that the matrix dimension must agree.

%universal constants
c = 345;        
rho = 407 / c;
L = 1;
%frequency here
N = 5;     % number of sections
dx = L / N;   
T = (L / c) / N;   
Fs = 1 / T;         % sample rate required
npoints = 2^12;
f = linspace(0, Fs, npoints);  % frequency vector
%equations here
w = 2*pi*f;
s = i*w;
rc = 0.00375;  
rrad = c / w;   
Ac = pi*(rc^2);
Arad = 2*pi*(rrad^2);
z0 = rho*c/Ac;
Yrad =  (Arad/(s*rc*rho))+(Arad/(rho*c));
Zrad = 1 / Yrad;
gamma = (Zrad-z0)/(Zrad+z0)
plot(abs(gamma))
end

Have a great day!

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Tobias 2013-4-8

在 MATLAB Online 中打开

I'm just about to go to the university, so I don't have time to do an in-depth look at your code, but one thing I see is your mathematical interaction between constants and vectors. I am pretty sure you need to do ./ or .^ etc, if the calculation is be be done on each element of a vector. For example everything that has f included in calculations.

A = 5
B = [5 2]
B .* A = [25 10]

Jan 2013-4-8

Please post a copy of the error message. Most of all it contains information about the line, where the problem occurs. Then we do not have to guess this line.

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