R語言繪圖-legend()添加圖例

legend(x, y = NULL, legend, fill = NULL, col = par("col"),
border = "black", lty, lwd, pch,
angle = 45, density = NULL, bty = "o", bg = par("bg"),
box.lwd = par("lwd"), box.lty = par("lty"), box.col = par("fg"),
pt.bg = NA, cex = 1, pt.cex = cex, pt.lwd = lwd,
xjust = 0, yjust = 1, x.intersp = 1, y.intersp = 1,
adj = c(0, 0.5), text.width = NULL, text.col = par("col"),
text.font = NULL, merge = do.lines && has.pch, trace = FALSE,
plot = TRUE, ncol = 1, horiz = FALSE, title = NULL,
inset = 0, xpd, title.col = text.col, title.adj = 0.5,
seg.len = 2)
x, y X,y用於定位圖例,也可用單鍵詞"bottomright", "bottom", "bottomleft", "left", "topleft", "top", "topright", "right" and "center";
legend 字符或表達式向量;
fill 用特定的顏色進行填充;
col 圖例中出現的點或線的顏色;
border 當fill = 參數存在的狀況下,填充色的邊框;
lty, lwd 圖例中線的類型與寬度;
pch 點的類型;
angle 陰影的角度;
density 陰影線的密度;
bty 圖例框是否畫出,o爲畫出,默認爲n不畫出;
bg bty != "n"時,圖例的背景色;
box.lty, box.lwd, box.col bty = "o"時,圖例框的類型,box.lty決定是否爲虛線,box.lwd決定粗線,box.col決定顏色;
pt.bg 點的背景色;
cex 字符大小;
pt.cex 點的大小;
pt.lwd 點的邊緣的線寬;
x.intersp 圖例中文字離圖片的水平距離;
y.intersp 圖例中文字離圖片的垂直距離;
adj 圖例中字體的相對位置;
text.width 圖例字體所佔的寬度;
text.col 圖例字體的顏色;
text.font 圖例字體;
merge logical, if TRUE,合併點與線,但不填充圖例框,默認爲TRUE;
trace logical; if TRUE顯示圖例信息;
plot logical. If FALSE不畫出圖例;
ncol 圖例中分類的列數;
horiz logical; if TRUE,水平放置圖例;
title 給圖例加標題;
inset 當圖例用關鍵詞設置位置後,inset = 分數,能夠設置其相對位置;
xpd xpd=FALSE,即不容許在做圖區域外做圖,改成TRUE便可,與par()參數配合使用;
title.col 標題顏色;
title.adj 圖例標題的相對位置,0.5爲默認,在中間。0最左,1爲最右;
seg.len lty 與lwd的線長,長度單位爲字符寬度。ide

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