can't multiply matrices

Question

Jam 2013-1-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/58658-can-t-multiply-matrices

Hi, I'm trying to multiply two matrices - a two by two and two by one - and it gives me the error message - ??? Array dimensions must match for binary array op. I can't see why this is not allowed?

Here's my code: -

 S           = 0.000043;
l           = 0.03;
f           = (linspace(20,14840,14821))';
c           = 345;
ABCD(1,1,:) = cos((l/c)*2*pi*f);
ABCD(1,2,:) = 1i*(415/S)*sin((l/c)*2*pi*f);
ABCD(2,1,:) = 1i/(415/S)*sin((l/c)*2*pi*f);
ABCD(2,2,:) = cos((l/c)*2*pi*f);
p_AT        = ones(length(f),1);
u_AT        = 3*10^-15;
U_AT        = (ones(length(f),1))*(u_AT/S);
Z_AT(1,1,:) = p_AT;
Z_AT(2,1,:) = U_AT;
Z_A0        = ABCD.*Z_AT;

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Answer 1

José-Luis 2013-1-13

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https://ww2.mathworks.cn/matlabcentral/answers/58658-can-t-multiply-matrices#answer_70968

Please try to use the debugger. It is generally more efficient than to have us debug your code remotely and might save you a lot of time in the future. In this case it is not working because ABCD and Z_AT don't have the same size and you are attempting element by element multiplication of their values.