cannot run the code because unknown about getMemberNames function

Dear all,

This is the answer of my professor about the ECG detection, but I cant run that code. Anyone know how to fix this, please help me

clc;
close all;
clear all;

load ecg_sbj1
load ecg_sbj2
load ecg_sbj3
load ecg_sbj4

nms = getMemberNames(heartrates);

Unrecognized function or variable 'heartrates'.

for k = 1:heartrates.NumMembers
    
    v = getLabelValues(heartrates,k,["QRSregions" "Rpeaks"]);
    
    hr = diff(cellfun(@(x) x.Location,v));
    
    subplot(2,1,k)
    histogram(hr,0.5:0.025:1.5)
    legend("hrv = " + std(hr))
    ylabel(nms(k))
    ylim([0 6])

end
function [labelVals,labelLocs] = findQRS(x,t,parentLabelVal,parentLabelLoc,varargin)

labelVals = cell(2,1);
labelLocs = cell(2,1);

if nargin<5
    Fs = 250;
else
    Fs = varargin{1};
end

df = 20;

load("trainedQTSegmentationNetwork","net")

for kj = 1:size(x,2)

    sig = x(:,kj);
      
    
    mitFSST = computeFSST(sig,Fs);
    
    
    netPreds = classify(net,mitFSST,MiniBatchSize==50);

    
    QRS = categorical([netPreds{1} netPreds{2}]',"QRS");
    msk = signalMask(QRS,MinLength==df,SampleRate==Fs);
    r = roimask(msk);
    
    
    labelVals{kj} = r.Value;
    labelLocs{kj} = r.ROILimits;

end

labelVals = vertcat(labelVals{:});
labelLocs = cell2mat(labelLocs);


end

Answer 1

[Cris LaPierre]

You need the Signal Processing Toolbox in order to use getMemberNames. If it is included on your license, you can use theAdd-ons Explorer to add it.

However, once added, you will find that you do not have a variable names heartrates.

[Tu Nguyen]

I checked my toolbox and have getMemberNames in the toolbox, as I understand that the hearates is run each ecg signal that load above. But the code syill not run. Please help me run the code

[Cris LaPierre]

I cannot create the variable for you. You must have code somewhere that does that already.

Each mat file of yours contains 2 variables - ecg and Fs. By loading them back to back the way you are doing, you will only be able to access the data in ecg_sbj4, as it overwrites all the others.

You may need to go back to your professor for more details.