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我正在尝试在 R 中创建项目符号类型列表，并希望将其保存为 pdf 格式，这成功地在窗口上打印了项目符号列表：

 a = paste0("Starting portfolio value: $", prettyNum(1000000,big.mark=",",scientific=F))
 b = "Inflation assumptions of 3% annually"
 c = "Average annual returns: 6%"
 d ="Average annual volatility: 7%"

 text = paste(a, "\n", b, "\n", c, "\n", d, "\n")

 library(grid)
 grid.points(x = rep(10,4), y = c(295, 318, 338, 360), pch = 15, gp = gpar(cex = 0.5))
 grid.text(text, x = 0.05, hjust = 0, gp = gpar(fontsize = 11))

但是，我希望能够将其与同一页面上的其他两个图表一起保存为 pdf 格式。

有什么办法吗？谢谢！