外文翻譯-基于matlab的數(shù)據(jù)曲線擬合分析(編輯修改稿)
2024-09-06 17:36 本頁面
【文章內容簡介】 ers b) generalized polynomial coefficients,thatf(x,b)=b0g0(x)+b1g1(x)+…bngn(x) (3) Wherein g0, g1, ..., gn called basis on various different choices may constitute a variety of typical and monly used linear the point of view of function approximation, equation (3) can be approximated reflect the nature of many of nonlinear models.In the least squares sense (3) fitting a linear model with a discrete set of points (1),parameter b can be obtained by solving equations=0(i=0,…,n)to determine,that solution on b0,b1,…,bn of linear algebraic equations(i=0,1,…，n), (4) Formula (i,j＝0,1,…，n), Equations (4) monly referred to as the normal equation or the normal equation, when m n, generally have a unique for the case of nonlinear model and the principle of least squares, the parameter b) can be determined (see numerical solution of nonlinear equations, optimization) nonlinear equations or calculations about the method optimization.Select the model For a given discrete data (1), the need to properly select the general model (2) of the function f (x, b) the type and specific form, which is the basis of fitting known, (1) the actual background of the law, that is the dependent variable y dependence of the empirical formula of the independent variable x has an expression determined directly take appropriate empirical formula is fitting the contrary, through the model (3) of the basis functions g0, g1, ..., gn (number and types) of different choices, each corresponding proposed merger by choosing the good g0, g1, ..., gn adaptation plays a role the model for testing, it is also known test way is: the number and types into a sufficient number of test functions in th
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