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如何在 R 中绘制多元多项式,例如 f(x,y) = 2 + x + x*y^2 + 3*x^3*y^2 ?
对于单变量多项式,多项式包可以做到,但我还没有找到多变量对应项。
library(emdbook) curve3d( 2 + x + x*y^2 + 3*x^3*y^2)