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r - 在 ggplot2 中创建用于绘图的循环会导致错误

问题描述

这已经以类似的风格发布过，但我现在已经调整了一些东西，希望（！）现在一切都清楚了

我试图创建一个循环以便为几个国家创建地块。

我的数据框：Plot_df

这里是数据的摘录：

year country iso2      sector emissions
1990 Belgium   BE         ETS         0
1990 Belgium   BE   Regulated  78614107
1990 Belgium   BE Unregulated  41870292
1991 Belgium   BE         ETS         0
1991 Belgium   BE   Regulated  79811521
1991 Belgium   BE Unregulated  43733190
...
2011 Belgium   BE         ETS  46203056
2011 Belgium   BE   Regulated  61319344
2011 Belgium   BE Unregulated  42839297
2012 Belgium   BE         ETS  43006980
2012 Belgium   BE   Regulated  58934979
2012 Belgium   BE Unregulated  42459997
2013 Belgium   BE         ETS  45231176
2013 Belgium   BE   Regulated  58383554
2013 Belgium   BE Unregulated  43586891
2014 Belgium   BE         ETS  43853144
2014 Belgium   BE   Regulated  56010346
2014 Belgium   BE Unregulated  40380694
2015 Belgium   BE         ETS  44713916
2015 Belgium   BE   Regulated  57375031
2015 Belgium   BE Unregulated  42854461
2016 Belgium   BE         ETS  43655728
2016 Belgium   BE   Regulated  56702848
2016 Belgium   BE Unregulated  43540863

dput(head(Plot_df, 15))提供这个

structure(list(year = c("1990", "1990", "1990", "1990", "1990", 
"1990", "1990", "1990", "1990", "1990", "1990", "1990", "1990", 
"1990", "1990"), country = c("Austria", "Austria", "Austria", 
"Belgium", "Belgium", "Belgium", "Bulgaria", "Bulgaria", "Bulgaria", 
"Croatia", "Croatia", "Croatia", "Cyprus", "Cyprus", "Cyprus"
), iso2 = c("AT", "AT", "AT", "BE", "BE", "BE", "BG", "BG", "BG", 
"HR", "HR", "HR", "CY", "CY", "CY"), sector = c("ETS", "Regulated", 
"Unregulated", "ETS", "Regulated", "Unregulated", "ETS", "Regulated", 
"Unregulated", "ETS", "Regulated", "Unregulated", "ETS", "Regulated", 
"Unregulated"), emissions = c(0, 38264402.6689529, 24027827.7997971, 
0, 78614106.9221497, 41870291.5153503, 0, 69103153.6445618,         
9569791.66793823, 
0, 17530229.1374207, 5911735.70632935, 0, 3135556.17528036, 1507499.48878214
)), row.names = c("378", "2836", "3100", "813", "8310", "8410", 
"558", "16410", "16510", "438", "24510", "24610", "783", "3261", 
"3271"), class = "data.frame")

我只展示了一个国家的全部数据，因为每个国家看起来都一样（除了不同的数字Plot_df$emissions）

我想要做的是（大多数你会从我下面的代码中看到）：

这是我尝试过的：

# Sets up the loop to run from i=1 through a list of countries from vector 
`Plot_df$country`
for(i in (1:length(unique(Plot_df$country)))){

# Color settings: colorblind-friendly palette
cols <- c("#999999", "#E69F00", "#56B4E9", "#009E73", "#F0E442", "#0072B2", 
        "#D55E00", "#CC79A7")

# Plotting code where DATA, YEAR, etc need to be handed the right vectors
p <- ggplot() +
geom_line(Plot_df,aes(x=year,y=emissions,group=sector),
          color=cols[1]) +
labs(x="Year",y="CO2 emissions",z="",title=paste("Emissions for", 
country[i])) + 
xlim(1990, 2016) +
ylim(-50,50) +
theme(plot.margin=unit(c(.5,.5,.5,.5),"cm"))
p

# Save plot, where the file name automatically gets a country name suffix
 ggsave(p,filename=paste("./FILENAME",country[i],".png",sep=""),width=6.5, 
     height=6)
}

我收到了这个错误，我不知道为什么

Error: `data` must be a data frame, or other object coercible by 
`fortify()`, not an S3 object with class uneval
Did you accidentally pass `aes()` to the `data` argument?

知道为什么会这样吗？

无论如何谢谢

标签： rloopsggplot2

解决方案

FWIW 少量的代码样式有很长的路要走。

for(country in unique(Plot_df$country)) {

  # YOU NEVER *REALLY* USE THIS VECTOR JUST ONE ELEMENT FROM IT

  # Color settings: colorblind-friendly palette
  c(
    "#999999", "#E69F00", "#56B4E9", "#009E73", 
    "#F0E442", "#0072B2", "#D55E00", "#CC79A7"
  ) -> cols

  # carve out the data for the plot
  country_df <- Plot_df[Plot_df$country == country,]

  # Plotting code where DATA, YEAR, etc need to be handed the right vectors
  ggplot() +
    geom_line(
      data = country_df, # THIS IS WHAT YOU FORGOT
      aes(year, emissions, group = sector), 
      color = cols[1] # WHY [1] IF YOU DEFINED A VECTOR
    ) +
    xlim(1990, 2016) + # SHOULD LIKELY USE scale_x_… and set limits there + expand=c(0,0) insteasd
    ylim(-50, 50) + # SAME
    labs(
      x = "Year", y = "CO2 emissions", 
      title = sprintf("Emissions for %s", country)
    ) + 
    theme(plot.margin = margin(.5, .5, .5, .5, "cm")) -> p # THERE IS A margin() function

  print(p) # it won't print without print()

  # Save plot, where the file name automatically gets a country name suffix
  ggsave(
    plot = p, 
    filename = sprintf("./FILENAME-%s.png", country), # I PREFER sprintf
    width = 6.5, 
    height = 6
  )
}

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