Finding polynomials from a set of coordinates

03102017, 07:42 PM
(This post was last modified: 03102017 09:06 PM by Han.)
Post: #2




RE: Finding polynomials from a set of coordinates
http://support.hp.com/usen/document/c01939749
EDIT: I don't have my HP50G in front of me and the screenshots in the link above do not list polynomial fit as a choice, so the link above my not apply directly to you if you are looking for a polynomial fit. So if there is no polynomial fit option, you would need to do it by hand using the Vandermonde matrix. https://en.wikipedia.org/wiki/Polynomial_regression EDIT #2: [[ 8 ] [ 5 ] [ 11 ] [ 16 ] [ 18 ] [ 14]] [ 0 4 8 12 16 20 ] VANDERMONDE / returns [[ 8 ] [ '439/120' ] [ '203/192' ] [ '151/1536' ] [ '13/3072' ] [ '3/40960' ]] This is a list of the cefficients \( a_0, a_1, \dotsm, a_5 \) of the polynomial \[ a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3 + a_4 \cdot x^4 + a_5 \cdot x^5 \] That is, \( a_0 = 8 \), \( a_1 = \frac{439}{120} \), \( a_2 = \frac{203}{192} \), \( a_3 = \frac{151}{1536} \), \(a_4 = \frac{13}{3072} \), and \(a_5 = \frac{3}{40960} \). Graph 3D  QPI  SolveSys 

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