How do I access specific data in R?

Question

Accessing a particular variable (i.e., column) in a data object is simple: DataObject$VarName , where DataObject is the data object and VarName the variable desired. The $ (dollar) symbol is how R links the requested variable to the data object. A single accessed variable is returned as a vector.

How do I pull specific data in R?

So, to recap, here are 5 ways we can subset a data frame in R:1Subset using brackets by extracting the rows and columns we want.2Subset using brackets by omitting the rows and columns we don't want.3Subset using brackets in combination with the which() function and the %in% operator.4Subset using the subset() function.

How do you access values in R?

To access the table values, we can use single square brackets. For example, if we have a table called TABLE then the first element of the table can accessed by using TABLE[1].

How do you access a specific element in a Dataframe in R?

We shall look into following items to access meta information and data of an R Data Frame :1Get Element at (i,j) ith row, jth column.2Extract column(s) of Data Frame.3Add row(s) to R Data Frame.4Add column(s) to R Data Frame.5Delete column(s) of R Data Frame.

How do I get certain rows in R?

Summary1Filter rows by logical criteria: my_data %>% filter(Sepal. Length >7)2Select n random rows: my_data %>% sample_n(10)3Select a random fraction of rows: my_data %>% sample_frac(10)4Select top n rows by values: my_data %>% top_n(10, Sepal. Length)

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