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1. numerical Derivative (score: 1): Author: yiwu ye <yiwu21111958@yahoo.com>; Date: Tue, 13 Sep 2005 19:13:04 -0700 (PDT); Dear list, I have a pair of data x and y, which have a curve relationship. How can I caculate the derivative of y against x at a certain point of x without knowing the function using S+? Any help is; /archives/html/s-news/2005-09/msg00038.html (7,068 bytes)
2. Re: numerical Derivative (score: 1): Author: Tim Hesterberg <timh@insightful.com>; Date: 14 Sep 2005 12:18:39 -0700; Is there noise in the data or not? Do you want to smooth or interpolate? There are a variety of smoothers in S-PLUS; the predict() method for smooth.spline() allows derivatives, I'm not sure about ot; /archives/html/s-news/2005-09/msg00042.html (7,590 bytes)

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