Use biplot(): How to plot three different colors after running PCA using only the first 2 principal components
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Hello,
I am new to Matlab and I do not know the syntax well enough to do this task.
I have a data set and I split it into training and testing data as below:
X = csvread('mydata.csv'); flag = X(:,1); label = X(:,2); P = X(:,3:end); train = X(flag < 5,:); test = X(flag == 5,:);
Now for the "label", which is the second column of data set X, there are three different values: 0, 8, 9. I want to distinguish between the three classes (0, 8, 9) with a different plot symbol and color.
My research so far lets me believe that biplot() is the right tool in MATLAB to do this, but I am not sure how to what function to call or how to manipulate different parameters in biplot() to help me with this.
Below is what I have got so far:
Zeros = label(label == 0); Eights = label(label == 8); Nines = label(label == 9); [coeff,score,latent] = pca(train);
plot (scores(Zeros), scores(Eights),scores(Nines),'.r','markersize', 20); hold on plot (scores(~Zeros), scores(~Eights),scores(~Nines),'^b', 'markersize', 7); Subscript indices must either be real positive integers or logicals.
% Error in myPCA (line 24) % plot (scores(Zeros), scores(Eights),scores(Nines),'.r','markersize', 20);
biplot(coeff(:,1:2),'scores',score(:,1:2)); % This works fine, but all of the data points are all red.
Thank you!
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