Section 1
Preview this deck
args(function name)
Front
| 5 | 0 | ||
| 4 | 0 | ||
| 3 | 0 | ||
| 2 | 0 | ||
| 1 | 0 |
Active users
0
All-time users
0
Favorites
0
Last updated
6 years ago
Date created
Mar 1, 2020
Cards (84)
Section 1
(50 cards)
args(function name)
Shows the arguments for a function.
what does R do with negative indexes such as [-1] ?
Excludes them
x<- 1:20
make sequence x=(1,2,..., 20)
<-
Assignment operator.
any ()
function that tests any element of a vector is TRUE in comparison.
mean (x)
Function that calculates the mean
What happens if you try to include both numbers and strings in a vector?
R converts the number to a string.
log(w)
returns the log of each element within vector w
ls()
Shows those R objects which are in current R workspace . Alt command: objects()
rm(x, y)
remove objects (x and y)
____ function to create a sequence (a to b) with an increment other than 1 (c).
seq (from=a, to=b, by=c)
rm()
Removes variables and functions and their structure.
cat
An alternative to the print function that let's you combine multiple items Into a continuous output.
?
Shortcut to the help command.
c(...)
Operator used to create a vector.
vec [x:y]
selects elements x through y of vector vec.
example(function name)
provides an example of a function
vec[c(w,y,z)]
selects non-sequential elements w,y,z from within vector vec.
vec [x]
selects xth element of vector vec.
??keyword
Shortcut for keyword search of documentation. Does not use quotation marks.
cor (x,y)
Function that calculates the correlation between two vectors.
plot(x, y)
plot points on a plane from set x and y
help(function name)
Displays the documentation for a function
vignette("vignettename")
View a particular vignette
vignette(package="package name")
View the vignette for a particular package.
boolean values TRUE and FALSE are called ___________ ________ in R.
logical values
help(package="packagename")
Displays information on a particular package.
help.search("keyword")
Performs a keyword search of the R documentation.
Task views
where to find out what packages may be useful for a given situation.
_____ tells R to ignore NA values
na.rm=TRUE
x <- rnorm(50)
store 50 numbers with normal distribution in x
ctrl- c
Interrupt R without terminating it
ls.str()
Show variables and their structure that have been defined in the workspace.
____ causes functions to return NA or even halt altogether.
NA values in vector argument
cov (x,y)
Function that calculates the covariance between two vectors
all ()
function that tests if all elements of a vector is TRUE in comparison.
/n
New line character. Used with the cat function for example.
vignettes
Additional documentation such as introductions, tutorials, or refererence cards that are installed on your computer when you install a package.
sd (x)
Function that calculates the standard deviation.
{ }
delimits the start and end of the body of a multi-line function
RSiteSearch("keyword")
Search the R site and mailing list for information without leaving R.
var (x)
Function that calculates the variance.
help(solve)
get more information about the function "solve". An alternative command ?solve
function to create a series of repeated values.
rep(x, times=y)
ls()
Show what variables have been defined in the workspace
sqrt(w)
returns the square root of each elements within vector w
q()
quit the R program
help.start()
view R documentation table of contents.
n:m
expression which creates a simple n+1 sequence
vignette()
See a list of all vignettes on your computer.
Section 2
(34 cards)