此函数做的是二元数据的样条拟合。格式：[coeffs,knotspots] = splnfit(x,y,knots,order,plots) -This function performs a spline fit of bivariate data.

数据拟合：一元函数插值、样条插值、多项式插值或拟合、曲线拟合、各种边界条件的样条插值、样条拟合、二元函数插值、拉格朗日插值法(Data fitting: interpolation of unary functions, spline interpolation, polynomial interpolation or fitting, curve fitting, spline interpolation of various boundary conditions, spline fitti

matlab拟合气液平衡数据，关联二元相互作用参数(Matlab fitting gas-liquid equilibrium data)