Subsetting countries for multi-panel figures in ggplot episode is too advanced

[naupaka]

I propose that instead of subsetting the plot to only show countries that begin with A or Z as facets (which I believe was done because the plot takes forever to generate if you try doing it for all countries at once), all of the subsetting code is removed and instead the plot is simply facetted by continent.

r-novice-gapminder/_episodes_rmd/08-plot-ggplot2.Rmd

Line 307 in f3d5c95

> ## Tip

[liz-is]

I taught at a workshop today that used this approach (facetting by continent) and it seemed to work well.

[ElenaSal55]

Hi, I was reading now the section 8, about creating graphics with ggplot2 and I noticed that the new script faceting by continent create a problem in the immidiately following script in "Modify text" and "Exporting the plot", because the object az.countries has not been created anymore in the Multi-panel figure section.

[ElenaSal55]

I think the ploblem could be fix by changing in the section "Modifying text" the first line of the code changing from "data = az.countries" to "data=americas". The same issue can be solved in the section "Exporting the plot" changing the first line of script from "lifeExp_plot <- ggplot(data = az.countries, .." in "lifeExp_plot <- ggplot(data = americas,..". I am new so I don't know if this can be a valid contribution for the check out as instructor

[ElenaSal55]

I solved the issue and created pull request #556

[jcoliver]

Addressed in #549 and #556