相关疑难解决方法(0)

我想为这个情节添加一个标题:

     library(lattice)
     x = 1:10
     y = rep(x,rep(10,10))
     x = rep(x,rep(10))
     z = x+y  
     levelplot(z~x*y,  
               colorkey = list(labels = list(cex=1,font=2,col="brown"), height=1, width=1.4),
               main = list('b',side=1,line=0.5))

哪个产生: