如下所示：

title(main = NULL, sub = NULL, xlab = NULL, ylab = NULL,
 line = NA, outer = FALSE, ...)

補(bǔ)充：R語(yǔ)言低級(jí)繪圖函數(shù)-title

title 函數(shù)用來在一張圖表上添加標(biāo)題

基本用法：

main 表示主標(biāo)題，通常位于圖像的上方， sub 表示副標(biāo)題，位于圖像的下方， xlab 表示x軸的標(biāo)簽，ylab 表示y軸的標(biāo)簽

par(oma = c(1, 1, 1, 1))
plot(1:5, 1:5, xlim = c(0,6), ylim = c (0,6), type = "n", xlab = "", ylab = "")
box(which = "figure", col = "red", lwd = 2)
box(which = "plot", col = "blue", lwd = 2)
title(main = "main tilte", sub = "sub title", xlab = "xlab", ylab = "ylab")

效果圖如下：

參數(shù)設(shè)置：

col : 設(shè)置標(biāo)題的顏色

cex : 設(shè)置標(biāo)題的文字大小

font : 設(shè)置標(biāo)題的文字的格式

以上三個(gè)參數(shù)可以針對(duì)不同的標(biāo)題分別進(jìn)行設(shè)置，需要注意的是xlab和ylab 不能分開設(shè)置，只能是同時(shí)設(shè)置，對(duì)應(yīng)的參數(shù)為 col.lab, col.cex, font.cex

代碼示例：

plot(1:5, 1:5, xlim = c(0,6), ylim = c (0,6), type = "n", xlab = "", ylab = "")
title(main = "main tilte", sub = "sub title", xlab = "xlab", ylab = "ylab", col.main = "red", cex.sub = 1.5, col.lab = "blue")

效果圖：

outer : 邏輯值，如果為TRUE, 將標(biāo)題放到plot area的外邊

代碼示例：

par(oma = c(5, 5, 3, 3))
plot(1:5, 1:5, xlim = c(0,6), ylim = c (0,6), type = "n", xlab = "", ylab = "")
box(which = "figure", col = "red", lwd = 2)
box(which = "plot", col = "blue", lwd = 2)
title(main = "main tilte", sub = "sub title", xlab = "xlab", ylab = "ylab", outer=TRUE)

效果圖如下：

title 中也允許表達(dá)式

代碼示例：

plot(1:5, 1:5, xlim = c(0,6), ylim = c (0,6), type = "n", xlab = "", ylab = "")
title(main = expression(sqrt(x)), sub = expression(x^2), xlab = "xlab", ylab = "ylab")

效果圖如下：

更多關(guān)于表達(dá)式的書寫，可以參考plotmath 函數(shù)的幫助文檔

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持服務(wù)器之家。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教。

原文鏈接：https://blog.csdn.net/t4ngw/article/details/106006556