R：绘图函数向数据

Question

我正在尝试绘制我在三个地点的数据的年度平均值。我经常使用plot（）函数，之前从未遇到过这样的问题。出于某种原因，每次我绘制这些数据时，它都会为第一个位置数据添加类似步骤的样式。我试图将“type =”更改为每个可能的替代方案，它似乎只是忽略它。我还尝试设置type =“n”，然后使用points（）添加数据，并且第一组数据的阶梯式样式仍然存在。

以下是我使用的数据集：

OrganicsRemoval <- data.frame(Year = c("1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", 
                                   "2005", "2006", "2007", "2008", "2009", "2010", "2011", "2012", "2013", "2014", 
                                   "2015", "2016"),
                          x = c(22,28,20,30,34,31,33,45,42,43,38,50,47,50,50,47,46,44,48,55,57,50),
                          y = c(18,23,25,16,23,24,24,31,36,39,36,42,39,40,42,46,40,42,40,42,44,42),
                          z = c(15,21,22,16,36,33,31,39,38,39,39,46,42,46,45,43,43,44,42,44,45,41))

以下是我用来绘制数据的代码：

par(mfrow = c(1,1))
plot(x = OrganicsRemoval$Year, y = OrganicsRemoval$x, type = "n", main = "TOC Percent Removal",
 ylab = "TOC Percent Removal", xlab = "Year", ylim = c(0,65))
points(x = OrganicsRemoval$Year, y = OrganicsRemoval$x, type = "b", col = "red")
points(x = OrganicsRemoval$Year, y = OrganicsRemoval$z, type = "b", col = "blue")
points(x = OrganicsRemoval$Year, y = OrganicsRemoval$y, type = "b", col = "black")
legend("topright", legend = c("x", "z", "y"), col = c("red", "blue", "black"), lwd = 1)

以下是输出内容： Output Plot

我非常感谢能够摆脱这些步骤式格式的任何帮助。谢谢！

Answer 1

将OrganicsRemoval$Year作为数字投射时，图表看起来是正确的。

创建数据框而不使用stringsAsFactors = FALSE字符串成为因素。我认为这造成了麻烦。 当没有作为数字进行转换时，“阶梯式”事物已出现在初始绘图语句中。

plot(x = as.numeric(OrganicsRemoval$Year), y = OrganicsRemoval$x, type = "n", main = "TOC Percent Removal",
 ylab = "TOC Percent Removal", xlab = "Year", ylim = c(0,65))

points(x = OrganicsRemoval$Year, y = OrganicsRemoval$x, type = "b", col = "red")
points(x = OrganicsRemoval$Year, y = OrganicsRemoval$z, type = "b", col = "blue")
points(x = OrganicsRemoval$Year, y = OrganicsRemoval$y, type = "b", col = "black")
legend("topright", legend = c("x", "z", "y"), col = c("red", "blue", "black"), lwd = 1)

或者，如上所述，您可以在创建数据框时使用stringsAsFactors = FALSE。