Nrthugu

this has been posted before in a similar style, but I have adjusted a few things now and hopefully (!) things are clear now

I've tried to create a loop in order to create plots for several countries.

My dataframe: Plot_df

Here an excerpt of the data:

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))delivers this

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")

I have only shown the whole data for one country, since every country looks the same (apart from different figures Plot_df$emissions)

What I want to do is (most you will see from my code below):

• create loop, so plots will be created for all countries


• x axis = year; y=emissions (of a country as in Plot_df$country)


• 3 groups (curves) should be from `Plot_df$sector: Regulated, Unregulated, ETS
  Regulated and unregulated should be between 1990:2016; ETS between 2005:2017.
  (these years are the years with data availability)

This is what I tried:

# 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)

}

I'm getting this error and I can't figure out why

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?

Any idea why this is happening?

Thanks in any case

FWIW a teensy bit of code styling goes a long way.

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

  )

}