How do I modify holdout sampling coding to bootstrap sampling ? I already have a code for holdout sampling, so how do I modify the coding to be a bootstrap sampling?

    clear,clc

    TrCut = 0.6;

    % Load Data, Random Data
    load Bacteria18Class.mat  % Original Dataset
    [r c] = size(RawData);
    y = randperm(r);
    Dataset = RawData(y,:); % Random Dataset
    n = r *TrCut;
    cn = max(Dataset(:,end));
    %Select 60% total samples after random for training set.
    %remaining 40% for testing.
    trdata = Dataset(1:n,:);
    tedata = Dataset(n+1:r,:);

    % Split Features and Classes
    % 60%of Train data in& out
    TrDataOut = trdata(:,end);
    TrDataIn = trdata(:,1:end-1);

    %remaining of test data in &out
    TeDataOut = tedata(:,end);
    TeDataIn = tedata(:,1:end-1);

    % transpos
    featr = TrDataIn;
    labtr = TrDataOut;
    feats = TeDataIn;
    labts = TeDataOut;

    disp('Please Wait...')
    k = 1;
    class = knnclassify(feats,featr, labtr ,k);
    index = labts==class;
    indexsum = sum(index);
    CR= (indexsum/(r-n))*100

    disp('Finish')