用R语言绘制函数曲线图的实例教程
最编程
2024-02-14 17:27:31
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# 定义函数 f
f = function (x) {
if (x >= 0) {
x
} else {
x ^ 2
}
}
# 生成自变量序列
x = seq(-2, 2, length=100)
# 生成因变量序列
y = rep(0, length(x))
j = 1
for (i in x) {
y[j] = f(i)
j = j + 1
}
# 绘制图像
plot(x, y, type='l')
f = function (x) {
if (x >= 0) {
x
} else {
x ^ 2
}
}
# 生成自变量序列
x = seq(-2, 2, length=100)
# 生成因变量序列
y = rep(0, length(x))
j = 1
for (i in x) {
y[j] = f(i)
j = j + 1
}
# 绘制图像
plot(x, y, type='l')
接下来我们使用 plot() 函数对向量数据进行绘图：
实例
# 向量数据
v <- c(7,12,28,3,41)
# 生成图片
png(file = "line_chart_label_colored.jpg")
# 绘图、线图颜色为红色，main 参数用于设置标题
plot(v,type = "o", col = "red", xlab = "Month", ylab = "Rain fall",
main = "Rain fall chart")
v <- c(7,12,28,3,41)
# 生成图片
png(file = "line_chart_label_colored.jpg")
# 绘图、线图颜色为红色，main 参数用于设置标题
plot(v,type = "o", col = "red", xlab = "Month", ylab = "Rain fall",
main = "Rain fall chart")