MATLAB: Adding EMG Signal With 50Hx Sinosoidal wave. Not getting it correct

emg+noiseMATLAB

Start Time =0.00025, time interval=0.00025 and end time=12.715
I have loaded emg signal of above specified time and adding it to 50Hz noise (sinosoidal Signal), but not getting it correctly, please reply
Thanks in Advance
emg = load('emg_healthy.txt');
figure(1);
subplot(3,3,1);
plot(emg(:,1), emg(:,2));
title('original EMG Signal');
t=0.00025:0.00025:12.715;
freqNoise = 50;   
amplNoise =0.0025;  
myNoise  = amplNoise.*sin(2*pi.*t.*freqNoise);
[a b]=size(emg);
myNoisetransp=transpose(myNoise);
[u v]=size(myNoisetransp)
   for j=1:(b-v)
      myNoisetransp(:,j+1)=0;
   end
subplot(3,3,2);
plot(t,myNoise);
title('50HZ Sinosoidal PL Noise');
noisysig=emg+myNoisetransp;
subplot(3,3,3);
plot(t,noisysig);
title('EMG+PL Noise');
Graph is generated but sinosoidal wave is not overlapped with EMG Signal

Best Answer

What is the scale of
emg(:,2)
myNoise may have a different scale than emg(:, 2) and become too small to display once the two signals are added.
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