R Functions Flashcards
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NOT
c()
Combine
length()
Tells length
head()
first six lines
tail()
last few lines
names()
returns column names
rownames()
returns row names
colnames()
returns column
dim()
returns dimensions
sort()
sorts vector in ascending or descending order
nrow()
counts the number of rows
%in%
which A are in B (gives TRUE or FALSE)
-
excludes variable
unique()
gives unique values
str()
gives the structure
system()
run basic commands
summary()
returns summary
rep()
replicate of values
~
“as a function of”
seq()
sequence
installed.packages()
already installed paackages
install.packages
install packages in ‘’
sum()
adds
sqrt()
square root
%%
remainder
mean()
mean
min()
minimum
max()
maximum
median()
median
var()
variance
sd()
standard deviation
quantile()
sample quantiles based on probabilities
prod()
returns product
round()
rounds numbers based on decimal point
setwd()
sets working directory
getwd()
outputs working directory
list.files()
finds files based on path
set.seed()
number to initiate the pseudorandom number generator
sample()
sample from a vector
for(xinY){}
for loop to cycle through commands
if(x==TRUE){}
if (x) is TRUE then do whatever is inside brackets
else{}
if whatever inside if statement is FALSE then do …
dev.new()
opens a new window
dev.off()
shuts off connection to file
plot()
plots your data
points()
adds points to plot
legend()
adds a legend
par()
changes parameters
pdf()
creates a pdf of Plot
stripchart()
gives stripchart of raw data
hist()
histogram
boxplot()
boxplot
mtext()
adds text to margins
abline()
y=mx+b
layout()
sets up a figure canvas up to 4 panels
