Matrix dimensions must agree when doing an elementwise operation

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댓글: Adrien Sallé 2022년 4월 18일
Hello, I would like to compute the product of two Fourier transform with the following code :
Fe=8000;
Te=1/Fe;
N=Fe;
t=0:Te:(N-1)*Te;
T=0.02;
x=1+square(2*pi*t/T);
K=10;
h=ones(1,K)/K;
y=conv(x,h);
Npts=Fe*T;
X=fft(x);
H=fft(h);
Y=fft(y);
prod=X.*H;
conv=fft(conv(x,h,'same'));
The objective here is to show that fft(h)*fft(x)= fft(conv(x,h)).
The problem is that even if I use the elementwise operator I get this error :
This is surely because of the size of the vector h, could anyone explain me what's wrong ?
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Torsten 2022년 4월 11일
X has 8000, H has 10 elements. There is no way to multiply the arrays.

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답변 (1개)

Esha Chakraborty 2022년 4월 14일
I understand that you are encountering the error - 'Matrix dimensions must agree', while performing element-wise matrix multiplcation of X and H variables in your code.
Please note that for matrix multiplcation, the sizes of X and H must be the same or be compatible. You can find more details on array size compatibility in the documentation here.
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Its way clearer now,
Thank you very much !

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