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nbfit
2007 Nov 06
1
How to find the zero (only the real solution) with the package polynom ?
...e to find the pair (a,b) so that a*b is the minimum but not from
the points I measured but from the fit of the curve (I have more points that
the ones given below but I fit only on this part because I
know that the minimum a*b is in this interval).
I thought doing it this way :
- to fit a*b=f(a)
abfit<-lm(ab ~ poly(a,8,raw=T))
- to use the package polynom to make the polynom
library(polynom)
polynomial(abfit$coefficients)
0.03537506 - 0.8506516*x + 8.302545*x^2 - 44.80418*x^3 + 144.2161*x^4 -
283.2458*x^5 + 331.1776*x^6 - 210.5144*x^7 + 55.86646*x^8
- to derive the polynom
deriv(polynomial...