WebMar 18, 2013 · Here is the code model = a*Cos [b*t + c]; fit = NonlinearModelFit [data, model, {a, b, c}, t, Method -> NMinimize] When I use the command: fit ["BestFitParameters"] the values are returned in the following format: {a -> 1, b -> 2, c -> -3} Now i want to store the value of a in a variable x x=fit ["BestFitParameters"] [ [1]] but this gives x= a -> 1 Web小木虫,论坛,科研. 分类: 共搜索到 1 个相关话题(最多显示前5000个) 作者: 最后发表
Fitting data to a circle with FindFit - Mathematica …
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NonlinearModelFit—Wolfram Language Documentation
WebMar 30, 2015 · 1 Answer Sorted by: 1 elaborating on my comment, here is a fit to the log of the data.. fit = a + b x + c Sqrt [x ] /. FindFit [MapAt [Log, A, {All, 2}], a + b x + c Sqrt [x ] , {a, b, c}, x] Show [ {LogPlot [ Exp [fit] , {x, 0, … WebMathematica performs what is known as a least-squares fit of the data when applying the FindFit function. In short, using the notation above, a least-squares fit is one that creates a function such that the following … WebFindFit [ data, expr, pars, vars] finds numerical values of the parameters pars that make expr give a best fit to data as a function of vars. FindFit [ data, { expr, cons }, pars, vars] finds a best fit subject to the parameter constraints cons. Details and Options Examples open all Basic Examples (1) Find a nonlinear fit to a list of primes: NDSolve[eqns, u, {x, xmin, xmax}] finds a numerical solution to the ordinary … FindFit and NonlinearModelFit fit equivalent models: NonlinearModelFit allows for … Wolfram Science. Technology-enabling science of the computational universe. … FindMinimum[f, x] searches for a local minimum in f, starting from an … FindFit gives parameter estimates for linear and nonlinear models: LinearModelFit … Fit[data, {f1, ..., fn}, {x, y, ...}] finds a fit a1\[InvisibleTimes]f1 + ... + … Wolfram Science. Technology-enabling science of the computational universe. … LeastSquares[m, b] finds an x that solves the linear least-squares problem for the … FindFormula[data] finds a pure function that approximates data. FindFormula[data, x] … Gradient is an option for FindMinimum and related functions that specifies the … dr rizai