Hello,
I've a set of data x and y that give a curve and I wanna find an approximation of this curve using the form y=a1*x+a3*x^3. Using the function polyfit I can obtain a cubic form y=a0+a1*x+a2*x^2+a3*x^3, but I need a0 and a2 equal to 0. How can i do?
Thank you in advance.
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