Invalid expression. Check for missing or extra characters.

Using the EKG simulator posted in eLearning, generate 20 cycles of the EKG waveform (when displaying the original, noisy or filtered signals in time-domain, show only two or three cycles).

(a) (10 points) Display the original EKG signal both in time-domain and frequency-domain.

(b) (10 points) Add the following two noises to the original signal: - a 60 Hz noise (with an amplitude of 1). - an additive white Gaussian noise (AWGN), i.e. independent and identically-distributed (i.i.d.) Gaussian random variables with 𝜇 = 0 and 𝜎 = 2. Display the noisy signal both in time-domain and frequency-domain.

(c) (20 points) Analyze the spectra of the original and noisy signals and design a suitable filter to extract the EKG signal from the noisy signal. Display the filter’s response. Display the filtered signal both in time-domain and frequency-domain.

Fs=1000;
t=0:(1/Fs):1-(1/Fs);
DISP_ECG_COUNT = 1000;
L = 50;
Ns=L;
ProjectPath = pwd;
ECGPath = strcat(ProjectPath,'\EKG_1.txt');
A=[];
fpt_1 = fopen(ECGPath,'r');
A = fscanf(fpt_1,'%g');
No_of_Data = length(A);
fclose(fpt_1);

x=[];
for r=1:DISP_ECG_COUNT
    x(r) = A(r,1);
end
figure:
plot(x);
title('Orignal ECG Signal Time Domain')             
xlabel('time')
ylabel('amplitude')

[Stephen23]

https://web.archive.org/web/20211203055156/https://www.mathworks.com/matlabcentral/answers/1601960-invalid-expression-check-for-missing-or-extra-characters

Answer 1

[Image Analyst]

This line

figure:  % No - don't use colon

should be

figure; % Use semicolon instead.

[Jeslin Joseph]

here is the EKG simulator

[Image Analyst]

OK, fine, but I don't need them. Getting rid of the colon got rid of the error "Invalid expression. Check for missing or extra characters." so I believe I solved your original error issue, right? I'm not going to do your whole homework for you.