我正在使用带有情节的knitr。我想将其中一个旋转 90 度。例如：
\documentclass{article}
\begin{document}
<<cache=TRUE, echo=FALSE, message=FALSE, warning=FALSE, comment=NA, eval=TRUE, results=asis>>=
library("ggplot2")
library("gridExtra")
func <- function(data,x,y) {
p1 <- ggplot(data.frame(data), aes(x = x, y = y)) + geom_point()
p2 <- ggplot(data.frame(data), aes(x = x, y = y)) + geom_point()
p3 <- ggplot(data.frame(data), aes(x = x, y = y)) + geom_point()
p4 <- ggplot(data.frame(data), aes(x = x, y = y)) + geom_point()
grid.newpage()
pushViewport(viewport(width = .9, height = .9,layout = grid.layout(nrow=2, ncol=2)))
print(p1,vp = viewport(layout.pos.row = 1, layout.pos.col = 1))
print(p2,vp = viewport(layout.pos.row = 2, layout.pos.col = 1))
print(p3,vp = viewport(layout.pos.row = 1, layout.pos.col = 2))
print(p4,vp = viewport(layout.pos.row = 2, layout.pos.col = 2))
grid.newpage()
pushViewport(viewport(width = .8, height = .5,layout = grid.layout(nrow=1, ncol=2)))
print(p1,vp = viewport(layout.pos.row = 1, layout.pos.col = 1))
print(p2,vp = viewport(layout.pos.row = 1, layout.pos.col = 2))
}
x <- runif(20,0,1)
y <- rnorm(20)
test <- cbind(x,y)
func(test,x=test$x,y=test$y)
@
\end{document}
我想将第二页和图表都旋转 90 度。我知道我可以将它用于一页：
\usepackage{pdflscape}
\begin{landscape}
....
\end{landscape}
但是这两个图是由 grid.newpage() 在一个函数中排列的。我怎样才能做到这一点？非常感谢！