← R Programming learning pathR Programming · Module 3 of 10
Data frames
Store tables of data in data frames.
📖 Key ideas
- A data frame is a table: columns are vectors of equal length.
- Create: data.frame(name = c("A","B"), age = c(20, 22)).
- Read CSV: read.csv("file.csv") or readr::read_csv.
- Inspect: head(df), str(df), summary(df), nrow(df).
- Access a column with df$age.
💡 Real-life example: A data frame is an Excel sheet inside R.
Data frameTable of columns
df$colAccesses a column
str()Shows structure
read.csvReads a CSV file