ggplot2 geom_smooth行没有显示在我的图表上 [英] ggplot2 geom_smooth line not showing up on my graph

问题描述

我试图通过使用 geom_smooth 来绘制数据来添加一行，但我遇到了困难。

以下是我的代码：

  plot.BG = ggplot（数据）+ geom_point（aes（x = Mass_LT，y = BG，color = factor（Temp.f）））
 plot.BG + geom_smooth（method =lm）
 
 BG 
＃[1] 79.56304 118.63903 84.03655 95.02984 67.90585 81.39920 74.73497 95.50199 
＃[9] 94.51260 88.08051 110.78937 96.89154 73.96888 74.04067 70.19670 69.80033 
＃[17] 64.49329 76.58780 98.73740 107.75642 71.05849 98.45971 101.67881 109.35420 
＃[25] 79.32484 69.71360 85.94306 101.25704 87.85497 119.07206 85.72013 98.91010 
＃[33] 95.27523 84.89955 93.42660 112.82913 121.77451 84.56991 67.66107 102.73335 
 
 Mass_LT 
＃[1] 0.000 6.154 0.000 2.128 3.169 5.986 1.916 0.000 5.956 0.566 0.000 0.000 0.530 4.813 
＃2.943 2.645 0.605 2.747 0.726 0.000 0.479 0.000 2.195 0.000 0.000 2.636 3.057 2.777 
＃1.909 4.657 0.000 0.000 0.000 0.000 3.203 0.000 0.000 6.157 0.635 0.000 
 
 sort（Mass_LT）
＃[1] 0.000 0.000 0.000 0。 000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 
＃[15] 0.000 0.000 0.479 0.530 0.566 0.605 0.635 0.726 1.909 1.916 2.128 2.195 2.636 2.645 
＃2.747 2.777 2.943 3.057 3.169 3.203 4.657 4.813 5.956 5.986 6.154 6.157 
  

Temp.f 是一个因素与2级，图表和点出来很好，但没有一条线，不能完全弄清楚为什么。任何帮助将不胜感激。

解决方案

在 ggplot（）被后续图层继承。但是，如果在图层中定义的映射（例如，在 geom_point（））内，则仅对该图层是局部的。既然你想让 geom_point 和 geom_smooth 图层使用相同的映射，把它们放在初始的 ggplot（）调用，它们将被两个继承。

可重复使用 mtcars code $：

pre $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ （aes（x = hp，y = mpg，color = factor（cyl））+
geom_smooth（）

＃您可以为geom平滑重复指定，但这是重复的
ggplot（mtcars）+
geom_point（aes（x = hp，y = mpg，color = factor（cyl））+
geom_smooth（aes（x = hp，y = mpg，color = factor ））

＃把所有层的映射放在前面以继承它
ggplot（mtcars，aes（x = hp，y = mpg，color = factor（cyl））+
geom_point（）+
geom_smooth（）


I am trying to add a line through my plotted data using geom_smooth, but I am running into difficulty.

Here is my code:

plot.BG = ggplot(data) + geom_point(aes(x=Mass_LT, y=BG, colour=factor(Temp.f)))   
plot.BG + geom_smooth(method="lm")

BG
#[1]  79.56304 118.63903  84.03655  95.02984  67.90585  81.39920  74.73497  95.50199
#[9]  94.51260  88.08051 110.78937  96.89154  73.96888  74.04067  70.19670  69.80033
#[17]  64.49329  76.58780  98.73740 107.75642  71.05849  98.45971 101.67881 109.35420
#[25]  79.32484  69.71360  85.94306 101.25704  87.85497 119.07206  85.72013  98.91010
#[33]  95.27523  84.89955  93.42660 112.82913 121.77451  84.56991  67.66107 102.73335

Mass_LT
#[1] 0.000 6.154 0.000 2.128 3.169 5.986 1.916 0.000 5.956 0.566 0.000 0.000 0.530 4.813
#[15] 2.943 2.645 0.605 2.747 0.726 0.000 0.479 0.000 2.195 0.000 0.000 2.636 3.057 2.777
#[29] 1.909 4.657 0.000 0.000 0.000 0.000 3.203 0.000 0.000 6.157 0.635 0.000

sort(Mass_LT)
#[1] 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
#[15] 0.000 0.000 0.479 0.530 0.566 0.605 0.635 0.726 1.909 1.916 2.128 2.195 2.636 2.645
#[29] 2.747 2.777 2.943 3.057 3.169 3.203 4.657 4.813 5.956 5.986 6.154 6.157

Temp.f is a factor with 2 levels, The graph and points come out fine, but without a line and can't quite figure out why. Any help would be greatly appreciated.

解决方案

Aesthetic mappings defined in ggplot() are inherited by subsequent layers. However, if mappings defined in a layer (e.g., inside geom_point()) are local to that layer only. Since you want the same mappings to be used by both the geom_point and the geom_smooth layers, put them in the initial ggplot() call and they will be inherited by both.

Reproducibly using mtcars:

# only the points are displayed
ggplot(mtcars) +
    geom_point(aes(x = hp, y = mpg, color = factor(cyl)) + 
    geom_smooth()

# you could respecify for the geom smooth, but that's repetitive
ggplot(mtcars) +
    geom_point(aes(x = hp, y = mpg, color = factor(cyl)) + 
    geom_smooth(aes(x = hp, y = mpg, color = factor(cyl))

# put the mapping up front for all layers to inherit it
ggplot(mtcars, aes(x = hp, y = mpg, color = factor(cyl)) +
    geom_point() + 
    geom_smooth()

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