Error using plot !

sinyal=audiorecorder(44100,16,1);
disp('start speaking')
recordblocking(sinyal,5);
play(sinyal);
myrec=getaudiodata(sinyal);
audiowrite('ses.wav', myrec, 44100);
z=myrec

figure               
voicefft = fft(z);
magnitude=abs(voicefft);
anglefft=angle(voicefft);
magx=max(magnitude);

subplot(211);
plot(abs(voicefft));
title('magnitude');

subplot(212);
plot(unwrap(angle(voicefft)));
title('phase');

f=10000;
Amp=2;
fs = 44100;
ts=1/44100;
T=5;
t=0:ts:T;
y=Amp*sin(2*pi*f*t);



x1=y';                             
y_noisy=z+x1(1:length(z));

figure               
noisyfft = fft(z);
magnoisy=abs(noisyfft);
anglenoisy=angle(noisyfft);
subplot(211);
plot(abs(noisyfft));
title('magnitude');

subplot(212);
plot((angle(noisyfft)));
title('phase');

figure
plot(t,z);
xlim([0 0.004]);

figure
plot(t,y_noisy);
xlim([0 0.004]);

figure
plot(t,y);
xlim([0 0.004]);

figure
plot(abs(z));
xlim([0 200]);
figure
plot(angle(z));
xlim([0 200]);

figure
plot(abs(y_noisy));

xlim([0 200])
figure
plot(angle(y_noisy));
xlim([0 200]);

audiowrite('bozukses.wav', y_noisy, 44100);

nfilt = 70;
Fst = 9000;

d = designfilt('lowpassfir','FilterOrder',nfilt, ...
               'CutoffFrequency',Fst,'SampleRate',fs);
           
xf = filter(d,y_noisy);
plot(t,xf,'-r','linewidth',1.5);
title 'Electrocardiogram'
xlabel 'Time (s)', legend('Original Signal','Filtered Signal')

grpdelay(d,f,fs)

delay = mean(grpdelay(d))

tt = t(1:end-delay);
sn = z(1:end-delay);

sf = xf;
sf(1:delay) = [];

plot(tt,sn);
plot(tt,sf,'-r','linewidth',1.5);
title 'Electrocardiogram'
xlabel('Time (s)'), legend('Original Signal','Filtered Shifted Signal')

►This my script codes but i give two errors.Error is 'Vectors must be same length' and 'LİNE (49) plot (t,z);'

How can ı fix these errors, please show my solution in my codes.

Answer 1

[Tommy]

z has length (44100 1/s) * (5 s) = 220500. t has length 220501. You could use linspace to ensure t has the correct length:

t = linspace(0, T, T*fs);