Polyfit
For polynomial fitting, SPL provides the function polyfit()
For example, again the data in the previous section, we use the form 
to fit
A |
|
…… |
…… |
14 |
=polyfit(A1,A2,2).conj() |
15 |
=A10.([~,A14(3)*~*~+A14(2)*~+A14(1)]) |
16 |
=A3.plot("Line","markerStyle":0,"lineColor":-65536,"axis1":"x","data1":A15.(~(1)),"axis2":"y", "data2":A15.(~(2))) |
17 |
=A3.draw(800,400) |
A14 Pass the x and y data into the function polyfit(X,Y,n), where n is the degree of the polynomial, taking 2, and return the fitting coefficient
Rank from bottom to top, 
A15-A17 Plot the curve of a quadratic function
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