统计建模与R软件第三章习题答案部分

it2022-05-07  25

#3.8 x <- seq(-2,3,0.05);y <- seq(-1,7,0.05) f <- function(x,y){x^4-2*x^2*y+x^2-2*x*y+4.5*x-4*y+4} z <- outer(x,y,f) par(mfrow = c(1,2)) contour(x,y,z,levels= c(0:5,seq(5,20,5),seq(30,60,10),80,100)) persp(x,y,z,theta = 35,phi = 30,expand = 1,col = "blue")

三维画图需要生成z轴,即对x,y在z=f(x,y)的关系下做外积运算。利用rgl包可生成3d版本的persp图形

library('rgl') persp3d(x,y,z,col = "blue") #抓取合适的角度 view <- par3d("userMatrix")

转载于:https://www.cnblogs.com/Dearc/p/4310701.html

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