The answer to question two is ,"mostly yes" and it offers an almost immediate answer to your question: funcD <- sapply(vars, function(v) D(func, ... ... <看更多>

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各位板友好我需要數學神人幫忙我證明此hessian matrix是正的條件http://images.plurk.com/vL9j-5WUFCLQoeW4PM1ZKMEFWmD.jpg Hessian Matrix. ... <看更多>

Introduction. Hessian matrix is useful for determining whether a function is convex or not. Specifically, a twice differentiable function f ... ... <看更多>

The curvature of the error surface is given by the eigenvalues λi of the Hessian matrix. so it gives me a bit of hint as to why it might be important to care if ... ... <看更多>