Graph plotting workshop I.
0. Install the Inkscape programme (download at https://inkscape.org/).
1. Import data describing lettuce varieties (lettuce.xlsx) to R
2. Create histograms of harvest days for both lettuce colours – combine them into a single two-panel
plot, remove the histogram titles
3. Adjust margins of the plots to improve the fill of the graphical layout and fix the ranges of y-axes to
the same values.
4. Try direct exporting to PowerPoint. Save the result in pdf or svg format. Open the svg file in the
Inkscape software, make some edits and save as pdf and export to png.
5. Reset the graphical parameters to single panel and default margins
6. Create scatterplot of harvest mass ~ harvest days
7. Change the point symbols to filled circles, change the colors of the points to illustrate the leaf colour
of the variety
8. Adjust point size
9. Change the orientation of y-axis values, adjust size of the axis titles and axis values
10. Add text "Lettuce varieties" somewhere inside the plot region and onto the plot margins
11. Add color-key legend to the plot
12. Facultative (but recommended) homework – export the graph to pdf/svg/powerpoint/word.
Graph plotting workshop II.
13. Create boxplot of harvest mass ~ leaf color
14. Create barplot of mean harvest mass classified by leaf color, add error bars indicating standard
errors/confidence intervals/ranges
13. Create dotchart of mean harvest mass classified by leaf color, add error bars indicating standard
errors/confidence intervals/ranges
14. Generate new data frame by:
big.data<-data.frame(y=rlnorm(30000, 4, 0.5)+sample(c(1,50, 8, 100,
9, 11, 20, 40, 20), 30000, replace=T), fact=c(rep("a", 12000),
rep("b", 18000)))
15. Create a boxplot of y ~ fact
16. Log scale the y-axis of the boxplot
16. Create a beanplot of y ~ fact; examine scaling of the y-axis and then try both linear and log-scaled
axis scaling
Homework (to be completed after the second graph plotting workshop): Create a graphically nice
plot with nice axis labels and minimum two panels – embed in into a word document with the code
used to generate the figure pastet below. Convert the word file to pdf named surname.pdf and upload to
Homework Vaults in IS. You can use your own real data or generate some imaginary data for this task.