如何使用ggplot2创建黑白透明重叠直方图？ [英] How to create black and white transparent overlapping histograms using ggplot2?

问题描述

我用ggplot2创建了两个透明的重叠直方图。

$ p $ test $ data.frame（condition = rep（c（每个= 500），值= rep（-1,1000））
test [1：500，] $ value = rnorm（500）
test [501：1000 ，] $ value = rnorm（500）+ 2

fig = ggplot（test，aes（x = value，fill = condition））+
#scale_fill_grey（）+
geom_histogram（position =identity，alpha = .5）
fig

看起来不错，但它的颜色。我需要一个灰度或黑色/白色阴谋。

使用scale_fill_grey（）会产生透明度很难读取的情节。

理想情况下，我想要一个使用纹理而不是颜色的黑色/白色阴谋，例如交叉阴影：///表示一种情况，\\\\ 对于其他情况，当条重叠时导致XXX。这是可能的吗？

解决方案

这怎么样（没有纹理仍然）？

  fig = ggplot（test，aes（x = value，fill = condition））+ 
 geom_histogram（position =identity，alpha = .8）+ 
 scale_fill_manual（values = c（grey20，grey60））+ theme_bw（）
 fig 
  

I used ggplot2 to create two transparent overlapping histograms.

test = data.frame(condition = rep(c("a", "b"), each = 500), value = rep(-1, 1000))
test[1:500,]$value = rnorm(500)
test[501:1000,]$value = rnorm(500) + 2

fig = ggplot(test, aes(x = value, fill = condition)) +
      #scale_fill_grey() +
      geom_histogram(position = "identity", alpha = .5)
fig

The resulting plot looks great, but it's in color. I need a grayscale or black/white plot.

Using "scale_fill_grey()" results in a plot with transparency that is very difficult to "read".

Ideally, I would like a black/white plot that uses texture instead of color, for instance, cross hatching: "///" for one condition, "\\\" for the other condition, resulting in "XXX" when the bars overlap. Is this possible?

解决方案

How about this (no texturing still)?

fig = ggplot(test, aes(x = value, fill = condition)) +
    geom_histogram(position = "identity", alpha = .8) + 
    scale_fill_manual(values=c("grey20", "grey60")) + theme_bw()
fig

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