How to plot line on graph

Hello. I want to plot a curve line.

When I used this, I got the graph.

I want to plot a red curve line without a blue stick. Could I get an idea to fix this code?

for i = 2:30:750
    X = csvread('kth_hog2_only.csv');
    Y = csvread('kth_hog2_only_class.csv');
    X = X(:,1:i);
    Mdl = fitcknn(X,Y,'NumNeighbors',3,...
    'NSMethod','exhaustive','Distance','cosine',...
    'Standardize',1);
    rng(1); % For reproducibility
    CVKNNMdl = crossval(Mdl, 'KFold', 5);
    classAccuracy(i) = 100 - kfoldLoss(CVKNNMdl, 'LossFun', 'ClassifError')*100;
    
end
plot(classAccuracy)
xlabel('Number of Clusters')
ylabel('CV Sum of Squared Distances')

Answer 1

[Star Strider]

Without your data, providing exact code is not possible.

In the interim, try this:

[pks,locs] = findpeaks(classAccuracy);

figure
plot(locs, pks, '-r')

or this:

L = islocalmax(classAccuracy);

x = 1:numel(classAccuracy);
figure
plot(x(L), classAccuracy(L), '-r')

Both should give the same result.

[Kong]

Thank you so much.

I used second method.

[Star Strider]

As always, my pleasure!