我正在尝试在plot3D中将z轴标签定义为R 0 ，下面是我的代码，我正在为zlab使用表达式，但是我得到了结果如下图所示。
library(plot3D)
lambda <- 1/12
sigma <- 0.4
gamma <- 0.4
beta <- 0.00007
c <-0.0034
m <- (0.08/12)
mu <- 1
f <- function(x,y){(beta*(x*(m+lambda)/((m+c)*(m+lambda)+m*y))*sigma*gamma)/((m+sigma+c)*(m+mu+c))}
x <- seq(0,1000,10)
y <- seq(0,1,0.01)
z <- outer(x,y,f)
persp3D(x=x,y=y,z=z,col.palette = heat.colors,phi = 20,theta = 300,nticks=4,zlab=expression('R'[0]),ylab = "k",xlab="A",xlim = c(0,1000),ylim = c(0,1),zlim = c(0,3.5),box = TRUE,border = NA,shade = .4,ticktype="detailed",scale= TRUE,expand = 0.5)
