Data Frames in R - Subsetting a data frame

How to subset a data frame using square brackets and the dollar sign.

We can subset data frames like we would subset a matrix, or like we would index a list.

To index a specific element in a data frame, we use square brackets, row index, coma, column index.

To reference a row, pass the row number in the square brackets and leave a space on the column indicator.

To reference a variable in a data frame, call the column number, leaving a space for the rows. Or use double brackets to call the column by name.

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