# Subset Even & Odd Rows & Columns in Data Frame R (4 Examples)

This tutorial explains how to extract odd and even rows and columns from data frame in R programming.

## Example Data

```data(iris) # Load example data head(iris) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 5.1 3.5 1.4 0.2 setosa # 2 4.9 3.0 1.4 0.2 setosa # 3 4.7 3.2 1.3 0.2 setosa # 4 4.6 3.1 1.5 0.2 setosa # 5 5.0 3.6 1.4 0.2 setosa # 6 5.4 3.9 1.7 0.4 setosa```

## Example 1: Selecting Even Columns in Data Frame

```iris_col_even <- iris[ , seq_len(ncol(iris)) %% 2 == 0] # Extracting even columns head(iris_col_even) # Sepal.Width Petal.Width # 1 3.5 0.2 # 2 3.0 0.2 # 3 3.2 0.2 # 4 3.1 0.2 # 5 3.6 0.2 # 6 3.9 0.4```

## Example 2: Selecting Odd Columns in Data Frame

```iris_col_odd <- iris[ , seq_len(ncol(iris)) %% 2 == 1] # Extracting odd columns head(iris_col_odd) # Sepal.Length Petal.Length Species # 1 5.1 1.4 setosa # 2 4.9 1.4 setosa # 3 4.7 1.3 setosa # 4 4.6 1.5 setosa # 5 5.0 1.4 setosa # 6 5.4 1.7 setosa```

## Example 3: Selecting Even Rows in Data Frame

```iris_row_even <- iris[seq_len(nrow(iris)) %% 2 == 0, ] # Extracting even rows head(iris_row_even) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 2 4.9 3.0 1.4 0.2 setosa # 4 4.6 3.1 1.5 0.2 setosa # 6 5.4 3.9 1.7 0.4 setosa # 8 5.0 3.4 1.5 0.2 setosa # 10 4.9 3.1 1.5 0.1 setosa # 12 4.8 3.4 1.6 0.2 setosa```

## Example 4: Selecting Odd Rows in Data Frame

```iris_row_odd <- iris[seq_len(nrow(iris)) %% 2 == 1, ] # Extracting odd rows head(iris_row_odd) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 5.1 3.5 1.4 0.2 setosa # 3 4.7 3.2 1.3 0.2 setosa # 5 5.0 3.6 1.4 0.2 setosa # 7 4.6 3.4 1.4 0.3 setosa # 9 4.4 2.9 1.4 0.2 setosa # 11 5.4 3.7 1.5 0.2 setosa```

## Further Resources

In the following, you may find some further resources on topics such as variables, matrices, and extracting data: