Quick Answer: How Do I Subset Specific Rows In R?

What is subset in R?

Subsetting in R is a useful indexing feature for accessing object elements.

It can be used to select and filter variables and observations.

You can use brackets to select rows and columns from your dataframe..

How do you create a Dataframe in R?

To combine a number of vectors into a data frame, you simple add all vectors as arguments to the data. frame() function, separated by commas. R will create a data frame with the variables that are named the same as the vectors used.

How do I subset certain rows in R?

So, to recap, here are 5 ways we can subset a data frame in R:Subset using brackets by extracting the rows and columns we want.Subset using brackets by omitting the rows and columns we don’t want.Subset using brackets in combination with the which() function and the %in% operator.Subset using the subset() function.More items…•

How do I remove a row from a specific value in R?

Delete or Drop rows in R with conditions:Method 1: … Method 2: drop rows using subset() function. … Method 3: using slice() function in dplyr package of R. … Drop Row by row number or row index: … Drop Row by row name : … Drop rows with missing values in R (Drop NA, Drop NaN) : … Method 1: Remove or Drop rows with NA using omit() function:More items…

How do I remove rows from a Dataframe in R?

You cannot actually delete a row, but you can access a dataframe without some rows specified by negative index. This process is also called subsetting in R language. A Big Note: You should provide a comma after the negative index vector -c().

How do I exclude a case in R?

To exclude variables from dataset, use same function but with the sign – before the colon number like dt[,c(-x,-y)] . Sometimes you need to exclude observation based on certain condition. For this task the function subset() is used. subset() function is broadly used in R programing and datasets.

How do I filter a Dataframe in R?

Subset Data Frame Rows in Rslice(): Extract rows by position.filter(): Extract rows that meet a certain logical criteria. … filter_all(), filter_if() and filter_at(): filter rows within a selection of variables. … sample_n(): Randomly select n rows.sample_frac(): Randomly select a fraction of rows.top_n(): Select top n rows ordered by a variable.

How does subset work in R?

The subset function is available in base R and can be used to return subsets of a vector, martix, or data frame which meet a particular condition. In my three years of using R, I have repeatedly used the subset() function and believe that it is the most useful tool for selecting elements of a data structure.

What does subset mean?

A set A is a subset of another set B if all elements of the set A are elements of the set B. In other words, the set A is contained inside the set B. The subset relationship is denoted as A⊂B. Since B contains elements not in A, we can say that A is a proper subset of B. …

How do I select a row in a Dataframe in R?

There are different functions to select or extract rows from the data frame using dplyr functions.Filter( ) filter(condition1, . . .)Sample_frac( ) – returns fraction part from the dataframe. … sample_n( ) – returns n rows from dataframe. … slice( ) – select range of rows using position. … top_n( ) – returns top n rows.