[求助]请教一下哈 关于曲线拟和

bainhome

cubic spline or B-spline

onlygh

还是没农明白

qbb

谢谢先

qbb

不过老说出错啊 是在画出的图像里设定么？我这样设定的：先出图，然后在tool里找到bisic fitting，然后不管点spline interpolant 还是cubic都会出错
说点数不够 可我明明有好多点啊。不明白ing

bainhome

我没用曲线拟和工具箱，我用的是样条工具箱里的样条函数csapi，四五个点足矣。

ericlin

General model Exp2:
f(x) = a*exp(b*x) + c*exp(d*x)
Coefficients (with 95% confidence bounds):
a = 1.167e+005 (1.062e+005, 1.273e+005)
b = 0.0001286 (-0.005982, 0.00624)
c = -5.69e+004 (-6.808e+004, -4.572e+004)
d = -1.034 (-1.779, -0.2893)

Goodness of fit:
SSE: 1.188e+008
R-square: 0.9817
Adjusted R-square: 0.9725
RMSE: 4449