Question

Am running these lines of code in the source, and then click “Run” in Rstudio.

fill_colors <- c()
for(i in 1:length(hotdogs$Country) ) {
  if (hotdogs$Country[i] == "United States") {
    fill_colors <- c(fill_colors, "#821122")
  } else {
    fill_colors <- c(fill_colors, "cccccc")
  }
}

The code gets passed down to the console, but for some reason, the plot doesn’t change.

Any idea why?

Answer 1

If you’re following http://www.cs.odu.edu/~mweigle/cs795/barchart-r.html:

I suspect you haven’t run the line directly after it, which is:

barplot(hotdogs$Dogs.eaten, names.arg=hotdogs$Year, col=fill_colors, 
        border=NA, xlab="Year", ylab="Hot dogs and buns (HDB) eaten")

Running only the lines you’ve given will generate a vector fill_colors, but you need to use that as a parameter for fill in barplot.