Full Multivariate Polynomial function

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Duc Nguyen
Duc Nguyen 2015-10-2
hi I have a question related to full polynomial function of two variables. I can write code to calculate the value of it but I dont know how to plot the contour at level 0. For example: given a full 5th-order polynomial
f(x,y) = theta1 + theta2*x + theta3*y + theta4*x*y + theta5*x^2 + theta6*y^2 + ... + theta24*x^5 + theta25*y^5
I already wrote the code to compute f(x,y) given theta, x and y but how can I plot this function
theta1 + theta2*x + theta3*y + theta4*x*y + theta5*x^2 + theta6*y^2 + ... + theta24*x^5 + theta25*y^5 = 0 ?
thank you!

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