Vector dimensions not right

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)');

[Walter Roberson]

What size is t ? You do not show us the initialization for it.

Answer 1

[KALYAN ACHARJYA]

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)');