R中具有相同时间x轴的多条曲线 [英] Multiple curves with same Time x-axis in R

问题描述

请您帮我解决这个问题。实际上，我想在带有R标记的x轴的R的同一图形上绘制多条曲线。

Could-you help me please in solving this issue. In fact, i would like to plot multiple curves on the same graph on R with a x-axis which is time labeled.

我尝试过此操作：

dayTime = strptime(sapply(c(0:110)+480, function(x){paste(floor(x/60),":",x%%60, sep="")}), "%H:%M") 
n = 10  
pdf("myGraph.pdf")
plot(x=dayTime, y=rep(0, length(dayTime)), main="myGraph", xlab="Time", ylab="Level", type="n", ylim=c(0, 0.05), xaxt = "n")
for(i in 1:n) 
{
    lines(myData[, i]), col=i)
}
r = as.POSIXct(round(range(dayTime), "hours"))
axis.POSIXct(1, at=seq(r[1], r[2], by="hour"), format="%H")
legend("topleft", legend=stockspool, col=c(1:n), lwd=rep(1, n), cex=0.8)
dev.off()

但问题是我不能在这种情况下添加带有线的曲线，但是如果我仅使用plot绘制一条曲线，它就可以正常工作。

but the problem is that i can not add a curve with lines in this context, but if i plot only one curve using plot, it works fine.

非常感谢。 / p>

Thank you very much.

推荐答案

以下解决方案使用 ggplot2 ：

首先创建一些示例数据：

First create some sample data:

df = data.frame(id = rep(letters[1:5], each = 100),
                time = rep(Sys.time() + 1:100, 5),
                value = runif(500) + rep(1:5, each = 100))
> head(df)
  id                time    value
1  a 2013-06-17 14:02:37 1.368671
2  a 2013-06-17 14:02:38 1.302188
3  a 2013-06-17 14:02:39 1.817873
4  a 2013-06-17 14:02:40 1.283439
5  a 2013-06-17 14:02:41 1.022949
6  a 2013-06-17 14:02:42 1.232590

并创建一个图。

library(ggplot2)
ggplot(df, aes(x = time, y = value, color = id)) + geom_line()

这篇关于R中具有相同时间x轴的多条曲线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！