How to get values from multiple plots obtained from a loop?

hi, I have an ECG data file for recording of 6- 8 hours.I implemented a window so that i have different pieces of data and i could apply function on it. I tried to run the window in the loop. *) My question how to get values for the iterations for different functions and plots. if I add the iteration as count, I could get any function run for those iteration within the loop but this thing doesn't seems to be applicable to every function. for example when I want to get the mean for count as RMSS (count)= mean(RR_interval); it works fine. but for RR_interval(count)= diff(Locs); it doesn't

specially i want to know how can i get the values from the multiple plots that are produce from the loop. Here is my code. %%

ECG_14003= R(27,:);
N_max=length(ECG_14003);
fs = 256;
n_window=5120;

for n_start = 1:n_window:(N_max-n_window)
    New_data = ECG_14003(n_start:(n_start+ n_window));
   [pks, locs]=findpeaks(New_data,'MinPeakProminence',100);% peak location of ECG in the current window
   RR_interval = diff(locs);%Peak interval
   RR_length= length(RR_interval);
   [pxx, F]=pwelch(RLocsInterval,RR_length, [],nfft,fs, 'twosided');
   plot(freq, 10*log10(pxx)); hold on
   xlabel('Frequency Hz')
   ylabel('power spectral density')
   count=count+1;
end

*) If I add hold on, would it give me the plots for each iteration? And how can i retrieve those values for F for each window/iteration

[Jeevan Joishi]

Hi Mahrukh,

I am afraid I did not fully understand what you meant by 'get the values from multiple plots'. Can you please elaborate on it.

That being said, I believe you are looking for a way to plot graphs in an iteration. Here are two possible scenarios that I can think of which might be useful to you -

1. If you plan on creating a separate figure in each iteration, you can simply add a the following statement before the call to 'plot' command.

>> figure;

This will cause each of the plots to be displayed on the separate figure.

2. Since your sample code has reference to the command 'hold on', so I have a strong feeling that you are looking to plot values from each iteration to the same graph and see sort of a trend line. You can use the function 'linkdata' that can be used to monitor changes to a variable in real time. More information about linkdata can be found at this link.

[mahrukh jamil]

Thank you for your answer. I did figure it out but your answer also gave me a new perspective.