Assignment operators Atomic vectors Numeric and integer types Logical values Character vectors NA missing values NULL Attributes

Vector recycling Vectorized arithmetic Comparison vectors Logical indexing Named vectors Sequence generation Rep function Which function

Matrices Arrays Lists Factors Data frames Tibbles concept Dates POSIXct datetimes

Single bracket vectors Double bracket lists Dollar operator Matrix indexing Negative indexing Logical masks Drop behavior Subset function

Function definitions Default arguments Lazy evaluation Ellipsis dots Lexical scoping Closures Return values On.exit

Apply Lapply Sapply Vapply Tapply Mapply Map Reduce

Transform Within Merge Aggregate Order Rank Split Reshape

Mean median Variance sd Quantiles Correlation Linear model lm Predict T test Chi squared test

Read.csv Write.csv ReadLines WriteLines SaveRDS ReadRDS Base plot Histogram

S3 classes S3 method dispatch S4 classes Environments Formulas Random seeds Warnings and errors TryCatch