散布行列の間とその間

Question

これらの2つの行列のためのMATLABコードを作成する助けてもらえますか？スタックオーバーフローへ

this are the formulas

Answer 1

w = 0; 

for i = 1:k 
    for j = 1:N(i) 
     x_diff = x(i,j) - mean(x(i,:)); 
     w = w + (x_diff * x_diff^T); 
    end 
end 

b = 0; 

for i = 1:k 
    x_diff = mean(x(i,:)) - mean(x); 
    b = b + (N(i) * x_diff * x_diff^T); 
end