Re: [math] how to get the second ferivatives of a group of data

2008-09-24 Thread Ted Dunning
> > Function F(x) does not have a formula to specify the relation between x > > and f(x), but for each x, I have got the value of f(x) by a measurement > > machine. > > > > I am interested in the point xi at which the second derivative of f(xi) > > is zero. > > > > Can anybody help me how to do tha

Re: [math] how to get the second ferivatives of a group of data

2008-09-24 Thread Luc Maisonobe
Yang, Shuli a écrit : > Here is the problem, First, please do include a [math] prefix in the subject line when you post a message related to commons-math to this list. It is shared by several sub-projects and it helps people filtering their mail. > > Function F(x) does not have a formula to spec

how to get the second ferivatives of a group of data

2008-09-24 Thread Yang, Shuli
Here is the problem, Function F(x) does not have a formula to specify the relation between x and f(x), but for each x, I have got the value of f(x) by a measurement machine. I am interested in the point xi at which the second derivative of f(xi) is zero. Can anybody help me how to do that?