Logical Operators
RStudio Panes
Data Types
Data Structures
Subsetting and Indexing
100
You can use this to test whether something on the left is less than or equal to something on the right.
<=
100
This pane shows the output of your R code.
Console
100
R treats this data type like numbers.
Numeric
100
This type of vector is neither radioactive nor very small, but it is coercive.
atomic vector
100
What would be printed in the output if you ran this code:
object <- c("goodbye", "see ya", "wouldn't wanna be ya")
object[2]
"see ya"
200
It's made out of sand and amber.
&
200
This pane will save your R code for later, but you can use it to run your code too.
Source
200
If you have more than one piece of text, you have a string. What data type is this?
Character
200
Using the c() function creates what kind of vector?
an atomic vector
200
You can index a ____ in three ways:
1. object[number]
2. object["name"]
3. object$name
list
300
Convert this logical sentence to R code that uses numeric data and logical operators: not 57
!57
300
This pane is where you can
Files
300
People say this data type is a real character at parties, but unlike a literal character, it has levels.
Factor
300
What data structure is like a list but with two dimensions?
a matrix
300
What does it mean to "subset" a dataframe?
Limit the dataframe to certain rows and/or columns
400
Convert this logical sentence to R code that uses character data and logical operators:
Cats or Squirrels are equivalent to Doggy Chew Toys.
"Cats" | "Squirrels" == "Doggie Chew Toys
400
If R objects were files, this pane would be your filing cabinet.
Environment
400
You can ask R if data is character data using this code: "_____.character()".
is
400
This data structure is the most common type of data structure, and has column names, row numbers, and sometimes even row names.
dataframe
400
What does the x and y stand for in this code?
object[x, y]
x is the row number, y is the column number or name
500
Sometimes people confuse this for "equivalent to" when it actually means something more like "assignment".
=
500
You can see the history of R functions you have run by looking in this pane.
Environment
500
5 is a factor when it should be numeric. How can you convert it to numeric in a way that prevents R from changing the number?
Convert 5 to a character first, then convert it to numeric.
500
Which type of vector shows you the chronological number of each entry by default (the output shows a number above each entry)?
list
500
How do you use subsetting to select more than one column column (but not all columns)?
object[, c("column.name.1", "column.name.2")