Category Archives: Newton

Charts for discussion

Posted on 24/02/2011 by dougaj4

See the comment from Georg Ströhlein under 2D Spline Interpolation with ALGLIB Here are the charts referred to:

Posted in Charts, Excel, Maths, Newton | Tagged , | 1 Comment

ALGLIB linear and polynomial fitting functions

Posted on 17/02/2011 by dougaj4

As promised here: Fitting high order polynomials this post presents details of four Excel User Defined Functions (UDFs) linking with ALGLIB functions for least squares fitting of linear and polynomial functions.  The new functions are: AL_Linest: AL_LinestCW: AL_PolyFit: and AL_PolyFitCW: These functions have been added … Continue reading →

Posted in AlgLib, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , | 5 Comments

Two more letters

Posted on 16/02/2011 by dougaj4

I can’t help feeling that I was a little unfair to Douglas Hofstadter in my last post, so as these were hypothetical letters, I will travel back in time, and send two more, enquiring whether a reductionist or a holistic … Continue reading →

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A Tail of Two Letters …

Posted on 14/02/2011 by dougaj4

… or the importance of being Douglas. I’m currently reading Douglas Hofstadter’s “I am a Strange Loop”, which has reminded me of two hypothetical imaginary letters that I never sent (and now never will) to Mr Hofstadter and Douglas Adams. … Continue reading →

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Fitting high order polynomials

Posted on 04/02/2011 by dougaj4

This post is a follow up to Using LINEST for non-linear curve fitting and the following comments from Scott Rogers and Lori Miller.  Scott found that he was getting different results from Linest and the xy chart trend line for polynomials of … Continue reading →

Posted in AlgLib, Charts, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , | 31 Comments