R語言 segments實例講解

R 語言中的 segment() 函數用于在特定點之間繪制線段。

用法: segments(x0, y0, x1, y1)

參數:
x, y:坐標以在提供的點之間繪制線段。

返回:給定點之間的線段

范例1:繪制單個線段

# Create empty example plotplot(0, 0, col = "white", xlab = "", ylab = "")??# Draw one linesegments(x0 = - 1, y0 = - 0.5, x1 = 0.5, y1 = 0, col = "darkgreen")?

輸出:

這里,x0 & y0 是線段的起點,x1 & y1 是線段的終點。

范例2:修改顏色、粗細和線型

# Create empty example plotplot(0, 0, col = "white", xlab = "", ylab = "")??# Draw one line as in Example 1segments(x0 = - 1, y0 = - 1, x1 = 0.5, y1 = 0.5,????????????????????# Color of line?????????col = "darkgreen",??????????????????????????# Thickness of line?????????lwd = 5,????????????????????????????????????# Line type?????????lty = "dotted")?????????????????????

輸出:

范例3:繪制多條線段到 R Plot。

# Create empty example plotplot(0, 0, col = "white", xlab = "", ylab = "")?????????# Create data frame with line-valuesmultiple_segments <- data.frame(x0 = c(0.1, 0.2, - 0.7, 0.4, - 0.8),??????????????????????????y0 = c(0.8, 0.3, 0.5, - 0.4, 0.3),???????????????????????x1 = c(0, 0.4, 0.5, - 0.5, - 0.7),???????????????????????y1 = c(- 0.3, 0.4, - 0.5, - 0.7, 0.8))??????????????????????????# Draw multiple lines????????????????????????segments(x0 = multiple_segments$x0,????????????????????????????y0 = multiple_segments$y0,?????????x1 = multiple_segments$x1,?????????y1 = multiple_segments$y1)

輸出: