如何自定义ggpairs中的行[GGally] [英] How to customize lines in ggpairs [GGally]

问题描述

我有以下情节:

使用以下代码生成:

library("GGally")
data(iris)
ggpairs(iris[, 1:4], lower=list(continuous="smooth", params=c(colour="blue")),
  diag=list(continuous="bar", params=c(colour="blue")), 
  upper=list(params=list(corSize=6)), axisLabels='show')

我的问题是:

1. 如何将相关线更改为红色，现在它是黑​​色的.
2. 相关线埋在散点图下方.我想把它放在最上面.我该怎么办?

1. How can I change the correlation line to be red, now it's black.
2. And the correlation line is buried under the scatter plot. I want to put it on top. How can I do that?

推荐答案

我希望有一种更简单的方法，但这是一种蛮力方法.但是，它确实为您提供了轻松轻松地自定义图的灵活性.要点是使用 putPlot 将 ggplot2 绘图放入图中.

I hope there is an easier way to do this, but this is a sort of brute force approach. It does give you flexibility to easily customize the plots further however. The main point is using putPlot to put a ggplot2 plot into the figure.

library(ggplot2)

## First create combinations of variables and extract those for the lower matrix
cols <- expand.grid(names(iris)[1:4], names(iris)[1:3])    
cols <- cols[c(2:4, 7:8, 12),]  # indices will be in column major order

## These parameters are applied to each plot we create
pars <- list(geom_point(alpha=0.8, color="blue"),              
             geom_smooth(method="lm", color="red", lwd=1.1))

## Create the plots (dont need the lower plots in the ggpairs call)
plots <- apply(cols, 1, function(cols)                    
    ggplot(iris[,cols], aes_string(x=cols[2], y=cols[1])) + pars)
gg <- ggpairs(iris[, 1:4],
              diag=list(continuous="bar", params=c(colour="blue")), 
              upper=list(params=list(corSize=6)), axisLabels='show')

## Now add the new plots to the figure using putPlot
colFromRight <- c(2:4, 3:4, 4)                                    
colFromLeft <- rep(c(1, 2, 3), times=c(3,2,1))
for (i in seq_along(plots)) 
    gg <- putPlot(gg, plots[[i]], colFromRight[i], colFromLeft[i])
gg

## If you want the slope of your lines to correspond to the 
## correlation, you can scale your variables
scaled <- as.data.frame(scale(iris[,1:4]))
fit <- lm(Sepal.Length ~ Sepal.Width, data=scaled)
coef(fit)[2]
# Sepal.Length 
#  -0.1175698 

## This corresponds to Sepal.Length ~ Sepal.Width upper panel

编辑

泛化为带有任何列索引和绘制相同的情节

Edit

To generalize to a function that takes any column indices and makes the same plot

## colInds is indices of columns in data.frame
.ggpairs <- function(colInds, data=iris) {
    n <- length(colInds)
    cols <- expand.grid(names(data)[colInds], names(data)[colInds])
    cInds <- unlist(mapply(function(a, b, c) a*n+b:c, 0:max(0,n-2), 2:n, rep(n, n-1)))
    cols <- cols[cInds,]  # indices will be in column major order

    ## These parameters are applied to each plot we create
    pars <- list(geom_point(alpha=0.8, color="blue"),              
                 geom_smooth(method="lm", color="red", lwd=1.1))

    ## Create the plots (dont need the lower plots in the ggpairs call)
    plots <- apply(cols, 1, function(cols)                    
        ggplot(data[,cols], aes_string(x=cols[2], y=cols[1])) + pars)
    gg <- ggpairs(data[, colInds],
                  diag=list(continuous="bar", params=c(colour="blue")), 
                  upper=list(params=list(corSize=6)), axisLabels='show')

    rowFromTop <- unlist(mapply(`:`, 2:n, rep(n, n-1)))
    colFromLeft <- rep(1:(n-1), times=(n-1):1)
    for (i in seq_along(plots)) 
        gg <- putPlot(gg, plots[[i]], rowFromTop[i], colFromLeft[i])
    return( gg )
}

## Example
.ggpairs(c(1, 3))

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