convert code from a python function to matlab
显示 更早的评论
How to convert the following python code to matlab code?
below I send the code.
Thank you so much
# lambda L;
def J(X):
L=0.5
Xorigin=np.zeros([2,1])
JA=np.mean(np.sum(np.power(X-np.tile(Xorigin,(1,P)),2),axis=0))
JB=0
for i in range(0,P):
for j in range(i+1,P):
JB+=1/np.sum(np.power(X[:,i]-X[:,j],2))
JB=JB/(P*(P-1)/2)
return JA+L*JB
Function:
采纳的回答
X = randi([-9 9], 10, 2)
disp(J(X))
function output = J(X)
L = 0.5;
S = size(X,1);
JA = sum(X.^2,2);
JB = sum(triu(squareform(1./pdist(X, 'squaredeuclidean'))),2);
output = sum(JA + JB)./S;
end
The equation you posted does not include a division by P*(P-1)/2 (for undefined variable P at that.)
The equation you posted is ambiguous about what the upper limit is for j. As s is not defined, it is possible that the size of X is greater than s, so the sum in the second part of the equation might include a potentially large number of terms.
The posted equation has j>=i but when j = i then 
is 0 and the term would be 1/0 which is infinity. That is not a useful equation, so we must suppose that j>i must be true. If s is the number of rows in X then for the last row, i = s, j>i would be empty, which leads to the question of whether adding emptiness should be treated the same as adding 0.
is 0 and the term would be 1/0 which is infinity. That is not a useful equation, so we must suppose that j>i must be true. If s is the number of rows in X then for the last row, i = s, j>i would be empty, which leads to the question of whether adding emptiness should be treated the same as adding 0.更多回答（1 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Call Python from MATLAB 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
