绘制两个 xts 对象 [英] Plotting two xts objects

问题描述

我正在使用 xtsExtra 绘制两个 xts 对象.

I'm using xtsExtra to plot two xts objects.

考虑以下对 plot.xts 的调用:

Consider the following call to plot.xts:

plot.xts(merge(a,b),screens=c(1,2))

用于在两个单独的面板中绘制 xts 对象 a 和 b.

which is used to plot the xts objects a and b in two separate panels.

如何控制 y 轴的间距?具体来说，我遇到了 y 轴标签过于接近甚至重叠的问题.

How do I control the spacing of the y-axes? Specifically, I'm running into the problem where the y-axis labels come too close or even overlap.

理想情况下，我想指定要在两个 y 轴标签之间保持的最小填充.任何帮助表示赞赏！

Ideally, I would like to specify a minimum padding which is to be maintained between the two y-axis labels. Any help is appreciated!

一个可重复的例子:

#install if needed
#install.packages("xtsExtra", repos="http://R-Forge.R-project.org")
library(xtsExtra)

ab=structure(c(-1, 0.579760106421202, -0.693649703427259, 0.0960078627769613, 
0.829770469089809, -0.804276208608663, 0.72574639798749, 0.977165659135716, 
-0.880178529686181, -0.662078620277974, -1, 2.35268982675599, 
-0.673979231663719, 0.0673890875594205, 1.46584597734824, 0.38403707067242, 
-1.53638088345349, 0.868743976582955, -1.8394614923913, 0.246736581314485
), .Dim = c(10L, 2L), .Dimnames = list(NULL, c("a", "b")), index = structure(c(1354683600, 
1354770000, 1354856400, 1354942800, 1355029200, 1355115600, 1355202000, 
1355288400, 1355374800, 1355461200), tzone = "", tclass = "Date"), class = c("xts", 
"zoo"), .indexCLASS = "Date", .indexTZ = "", tclass = "Date", tzone = "")

plot.xts(ab,screens=c(1,2))

产生:

推荐答案

抱歉，花了这么长时间.我试图弄清楚为什么我的图表从 2012 年 12 月 4 日开始到 2012 年 12 月 13 日结束，而你的图表从 2012 年 12 月 5 日开始到 2012 年 12 月 14 日结束.你能检查一下以确保 ab 您在上面发布的 ab 与您用来绘制图表的 ab 相同吗?

Sorry this took so long. I was trying to figure out why my graph starts at Dec 04, 2012 and ends at Dec 13, 2012, when yours starts at Dec 05, 2012 and ends at Dec 14 2012. Can you check to make sure that the ab you posted above is the same ab you used to plot your graph?

此外，我使用了库 xts 而不是 xtsExtra.是否有理由使用 xtsExtra ?

Also, I used library xts instead of xtsExtra. Is there a reason to use xtsExtra ?

代码如下:

library(xts)

ab=structure(c(-1, 0.579760106421202, -0.693649703427259, 0.0960078627769613, 
           0.829770469089809, -0.804276208608663, 0.72574639798749, 0.977165659135716, 
           -0.880178529686181, -0.662078620277974, -1, 2.35268982675599, 
           -0.673979231663719, 0.0673890875594205, 1.46584597734824, 0.38403707067242, 
           -1.53638088345349, 0.868743976582955, -1.8394614923913, 0.246736581314485), .Dim = c(10L, 2L), .Dimnames = list(NULL, c("a", "b")), index = structure(c(1354683600, 
          1354770000, 1354856400, 1354942800, 1355029200, 1355115600, 1355202000, 
          1355288400, 1355374800, 1355461200), tzone = "", tclass = "Date"), class = c("xts", 
          "zoo"), .indexCLASS = "Date", .indexTZ = "", tclass = "Date", tzone = "")

#Set up the plot area so that multiple graphs can be crammed together
#In the "par()" statement below, the "mar=c(0.3, 0, 0, 0)" part is used to change
#the spacing between the graphs.   "mar=c(0, 0, 0, 0)" is zero spacing.
par(pty="m", plt=c(0.1, 0.9, 0.1, 0.9), omd=c(0.1, 0.9, 0.2, 0.9), mar=c(0.3, 0, 0, 0))

#Set the area up for 2 plots
par(mfrow = c(2, 1))

#Build the x values so that plot() can be used, allowing more control over the format
xval <- index(ab)

#Plot the top graph with nothing in it =========================
plot(x=xval, y=ab$a, type="n", xaxt="n", yaxt="n", main="", xlab="", ylab="")
mtext(text="ab", side=3, font=2, line=0.5, cex=1.5)

#Store the x-axis data of the top plot so it can be used on the other graphs
pardat <- par()

#Layout the x axis tick marks
xaxisdat <- index(ab)

#If you want the default plot tick mark locations, un-comment the following calculation
#xaxisdat <- seq(pardat$xaxp[1], pardat$xaxp[2], (pardat$xaxp[2]-pardat$xaxp[1])/pardat$xaxp[3])

#Get the y-axis data and add the lines and label
yaxisdat <- seq(pardat$yaxp[1], pardat$yaxp[2], (pardat$yaxp[2]-pardat$yaxp[1])/pardat$yaxp[3])
axis(side=2, at=yaxisdat, las=2, padj=0.5, cex.axis=0.8, hadj=0.5, tcl=-0.3)
abline(v=xaxisdat, col="lightgray")
abline(h=yaxisdat, col="lightgray")
mtext(text="ab$a", side=2, line=2.3)
lines(x=xval, y=ab$a, col="red")
box() #Draw an outline to make sure that any overlapping abline(v)'s or abline(h)'s are covered

#Plot the 2nd graph with nothing in it ================================
plot(x=xval, y=ab$b,  type="n", xaxt="n", yaxt="n", main="", xlab="", ylab="")

#Get the y-axis data and add the lines and label
pardat <- par()
yaxisdat <- seq(pardat$yaxp[1], pardat$yaxp[2], (pardat$yaxp[2]-pardat$yaxp[1])/pardat$yaxp[3])
axis(side=2, at=yaxisdat, las=2, padj=0.5, cex.axis=0.8, hadj=0.5, tcl=-0.3)
abline(v=xaxisdat, col="lightgray")
abline(h=yaxisdat, col="lightgray")
mtext(text="ab$b", side=2, line=2.3)
lines(x=xval, y=ab$b, col="blue")
box() #Draw an outline to make sure that any overlapping abline(v)'s or abline(h)'s are covered

#Plot the X axis =================================================
axis(side=1, label=format(as.Date(xaxisdat), "%b %d\n%Y\n") , at=xaxisdat, padj=0.4, cex.axis=0.8, hadj=0.5, tcl=-0.3)
mtext(text="Date", side=1, line=2.5)

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