ggplot2可视化绘制在彼此之上绘制的点数：stat_bin2d或geom_tile或点大小？ [英] ggplot2 visualizing counts of points plotted on top of each other: stat_bin2d or geom_tile or point size?

问题描述

我的问题很简单：我有一些x，y坐标点，它们位于由1x1方块组成的矩形网格内。这些点具有平均坐标，因此几个点被赋予相同的坐标（它们完全重叠）。可重复的例子：

$ p $ ＃生成假数据
y < - seq（from = 0.5，to = 9.5，by = 1）
x < - seq（从= 0.5到= 4.5，by = 1）
xnew <样本（x，100，替换= T）
新< （y，100，replace = T）
data < - data.frame（xnew，ynew）

＃创建图表
ggplot（data，aes（x = y = ynew））+ geom_point（）


我想表示特定位置的点的频率（x，y坐标，代表特定的正方形）。 stat_bin2d 是朝正确方向迈出的一步，但对于地图上的不同位置，这些箱子是莫名其妙的（对我来说），因此难以直观地看到分布。

我可以想象两种不同的解决方案：

<1>有没有办法让分档居中？有时候左下角是在这个点上，有时是右下角，等等：

另外，如果这些盒子足够大以便彼此接触，但是当我更改 binwidth = c（1,1）在 stat_bin2d（）中，它实际上改变了计数，尽管箱不应该重叠，因为所有点至少1 b
$ b

或使用积分尺寸：

2）我宁愿点大小会反映浓度（这种方式在黑白方面会更好）。我尝试了geom_point（）：

pre $ g $ pggplot（data，aes（x = xnew，y = ynew））+ geom_point（aes （x = xnew，y = ynew，size = .. count ..））

  eval中的错误（expr，envir，enclos）：找不到对象'count'
  

然后，如果我添加`stat =bin，它会与赋值为y的值冲突。我看了这里：为什么不会wont ggplot2允许我为每个点设置一个大小？，但无法使其工作。

感谢您期待任何帮助。

解决方案

ggplot2版本2.0.0引入 geom_count（）来做到这一点。使用您的数据：

  ggplot（data，aes（x = xnew，y = ynew））+ 
 geom_count（ ）
  

收益率：

My problem is simple: I have some points with x,y coordinates, which are positioned inside a rectangular grid made up of 1x1 squares. These points have averaged coordinates, so that several points are given the same coordinates (they overlap completely). Reproducible example:

# generate fake data
y <- seq(from=0.5, to=9.5, by=1)
x <- seq(from=0.5, to=4.5, by=1)
xnew <- sample(x,100,replace=T)
ynew <- sample(y,100,replace=T)
data <- data.frame(xnew,ynew)

# create chart
ggplot(data, aes(x=xnew, y=ynew)) + geom_point()

I want to represent the frequency of points at a particular location (x,y coordinate, representing a particular square). stat_bin2d is a step in the right direction, but the bins are inexplicably (for me) placed at different spots on the map, making it difficult to see the distribution visually.

I can imagine two different solutions:

1) Is there a way to center the bins on the points? Sometimes the lower left-hand corner is at the point, sometimes the lower right-hand corner, etc. like this:

Additionally, it would be ideal if the boxes would be big enough to touch each other, but when I change the binwidth=c(1,1) in stat_bin2d(), it actually changes the counts, although the bins should not overlap, since all points are at least 1 square away from each other.

or, using point sizes:

2) I would prefer points whose size would reflect the concentration (that way would be better in black and white, too). I tried with geom_point():

ggplot(data, aes(x=xnew, y=ynew))+geom_point(aes(x=xnew,y=ynew, size=..count..))

but I got

Error in eval(expr, envir, enclos) : object 'count' not found

and then, if I add `stat="bin", it conflicts with the assignment to y. I looked here:Why wont ggplot2 allow me to set a size for each individual point?, but was not able to make it work.

Thanks in anticipation for any help.

解决方案

ggplot2 version 2.0.0 introduced geom_count() to do precisely this. With your data:

ggplot(data, aes(x=xnew,y=ynew)) +
  geom_count()

Yields:

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