Vector dimensions not right

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Nathan Jaqua
Nathan Jaqua 2019-9-29
回答： KALYAN ACHARJYA 2019-9-29
trying to added the cosine wave as a noise vector to the pwelch command, but the software says 'Matrix dimensions must agree'. What's wrong with my code?
f2 = 5000;
A2 = 0.25;
t2 = 0:1/f2:5-1/f2;
x2 = A2*cos(2*pi*f2*t)+randn(size(t2));
[y,Fs]=audioread('doorbell.wav');
[pxx,f] = pwelch(x2,[],[],[],Fs);
plot(f,10*log10(pxx)); xlabel('Frequency (Hz)'); ylabel('PSD (dB/Hz)');
  1 个评论
Walter Roberson
Walter Roberson 2019-9-29
What size is t ? You do not show us the initialization for it.

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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-9-29
As already @Walter sir specified, you did not provide us the "t" data, here I have assumed the t data as same as t2
Please assign any "t" data as you want, but ensured that the size of t and t2 must be same.
f2 = 5000;
A2 = 0.25;
t = 0:1/f2:5-1/f2;
t2 = 0:1/f2:5-1/f2;
x2 = A2*cos(2*pi*f2*t)+randn(size(t2));
[y,Fs]=audioread('doorbell.wav');
[pxx,f] = pwelch(x2,[],[],[],Fs);
plot(f,10*log10(pxx)); xlabel('Frequency (Hz)'); ylabel('PSD (dB/Hz)');
ui.png

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