dput(X)在GGPLOT2
structure(list(Host = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L), .Label = "A", class = "factor"), TimeStamp = structure(c(1L,
2L, 3L, 4L, 5L, 1L, 2L, 3L, 4L, 5L), .Label = c("1/11/2013",
"1/12/2013", "1/13/2013", "1/14/2013", "1/15/2013"), class = "factor"),
Instance = structure(c(1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L,
2L), .Label = c("/application", "/db"), class = "factor"),
Free_Space = c(5048L, 5049L, 6000L, 4800L, 5100L, 317659L,
340000L, 350000L, 356666L, 370000L), Used_Space = c(3017L,
56000L, 60000L, 55000L, 54000L, 271657L, 150000L, 175000L,
165000L, 189999L), Total_Space = c(8064L, 61049L, 66000L,
59800L, 59100L, 589316L, 490000L, 525000L, 521666L, 559999L
)), .Names = c("Host", "TimeStamp", "Instance", "Free_Space",
"Used_Space", "Total_Space"), class = "data.frame", row.names = c(NA,
-10L))
我有这个数据帧做geom_hline时选择最新数据集。我通过在给定Host,TimeStamp和Instance的情况下使用data.table包添加Free_Space和Used_Space来驱动列名Total_Space。
x<-data.table(x)
x<-x[,Total_Space:=Free_Space+Used_Space, by=c("Host", "Instance", "TimeStamp")]
我喜欢用ggplot facet_wrap从GGPLOT2到图形在GB用空间和由TOTAL_SPACE绘制geom_line,使用户可以看到有多少头部空间也有。
例如,我这样做:
ggplot(x, aes(TimeStamp, Used_Space/1024, group=Instance)) + geom_area(fill="blue") + geom_smooth(method="lm", colour="orange",se=T, size=1) + geom_hline(data=x, aes(yintercept = Total_Space/1024), col="red")+ facet_wrap(~Host+Instance, ncol=3, scales="free")
我看到的问题是,我得到了同样instnace和主机的多个geom_hline,由于TOTAL_SPACE正在发生变化。
我的问题是,如何为每个实例和主机执行geom_hline时选择最新的时间戳?我需要在geom_hline中显示最新的Total_Space。
我尝试这样的方法:
X < -x [,LatestTS:=尾部(P [顺序(第$时间戳),],1)$ TOTAL_SPACE,通过= C( “主机”,“实例“,”TimeStamp“)]
没有工作。它会为所有实例选择相同的编号。
谢谢你的工作。 – user1471980 2013-03-14 19:26:11