Displaying 1 result from an estimated 1 matches for "standardalgorithm".
2005 Jun 21
2
nls(): Levenberg-Marquardt, Gauss-Newton, plinear - PI curve fitting
...;k":
V1 V2
[1,] 0 0.367
[2,] 85 0.296
[3,] 122 0.260
[4,] 192 0.244
[5,] 275 0.175
[6,] 421 0.140
[7,] 603 0.093
[8,] 831 0.068
[9,] 1140 0.043
With the nls()-function i want to fit following formula whereas a,b, and c
are variables: y~1/(a*x^2+b*x+c)
With the standardalgorithm "Newton-Gauss" the fitted curve contain an peak
near the second x,y-point.
This peak is not correct for my purpose. The fitted curve should descend
from the maximum y to the minimum y given in my data.
The algorithm "plinear" give me following error:
phi function(x,y) {...