stephpenn1 commented 5 years ago

In addition to cars, R has a built-in dataset called mtcars.

[x] Take a look at it; print its summary; get the number of rows and columns.
[x] Extract the drat column from mtcars and prints its summary. Which row of the dataset has the maximum drat value? Write code to find this.
[x] Do plot(mtcars). Whoah! What’s going on here? What has plot done?
[x] Plot, using ggplot2's qplot function, miles per gallon versus horsepower. Color the points by one of the other columns.
[x] Save the figure using the ggsave() command
[x] Upload your lovely figure and the code you wrote for the second task as a comment.

Tips:

type ?qplot to get help
remember to load the ggplot2 package first

Feel free to slack/email/find us if you need any help!

marideeweber commented 5 years ago

weberpractice2

find which row has the maximum drat value

which.max(mtcars$drat)

haileymoore commented 5 years ago

mpg_hp_plot

lilliehaddock commented 5 years ago

hp_mpg_disp

row of dataset with the maximum drat value

which.max(mtcars$drat) print(which.max(mtcars$drat))

bpbond commented 5 years ago

Nice all! 👏 Clearly that was too easy.

[x] Read about R's subset() function (in particular, look at the examples on its help page). Understand it.
[x] Subset mtcars to just the 4-cylinder engines, and then plot mpg vs. hp as above, but with a panel (see ggplot's facet_wrap()) for each value of carb.

haileymoore commented 5 years ago

mpg_hp_carb_panels

marideeweber commented 5 years ago

weberpractice2again

lilliehaddock commented 5 years ago

hp_mpg_carb

bpbond commented 5 years ago

Very nice people! 👏 Closing this, unless you're really dying for more data manipulation exercises. @stephpenn1 and I will work on agenda/syllabus for next week.

PNNL-PREMIS / SULI2019

R workshop 2019-06-04 Practice #2

find which row has the maximum drat value

row of dataset with the maximum drat value