 # R Program to convert a given data frame to a list by rows

August 26, 2021, Learn eTutorial
1097

## How to convert a given data frame to a list by rows

Here we are explaining how to write an R program to convert a given data frame to a list by rows. Here we are using a built-in function data.frame(). A data frame is used for storing data tables which has a list of vectors with equal length. The data frames are created by function data.frame(), which has tightly coupled collections of variables. The syntax of this function is,

``````

data.frame(…, row.names = NULL, check.rows = FALSE,check.names = TRUE, fix.empty.names = TRUE,stringsAsFactors = default.stringsAsFactors())
```
```

Where dots(...) indicates the arguments are of either the form value or tag = value and row. name is a NULL or a single integer or character string.

## How to convert a given data frame to a list by rows in the R program

Below are the steps used in the R program to convert a given data frame to a list by rows. In this R program, we directly give the data frame to a built-in function. Here we are using variables E, N, S, A, Q for holding different types of vectors. Call the function data.frame() for creating data frame. Finally, Convert the data frame into list L by calling split(E, seq(nrow(E))). Here split() helps to divide the vector or data frame containing values into groups. And seq() method helps to generate regular sequences.

## ALGORITHM

STEP 1: Assign variables E,N,S,A,Q with vector values

STEP 2: Create a data frame E with given values

STEP 3:  Print the data frame

STEP 4:  Convert the data frame into list L by calling split(E, seq(nrow(E)))

STEP 5:  Print the new list L

## R Source Code

```                                          ```E = data.frame(
N = c('Jhon', 'Hialy', 'Albert', 'James', 'Delma'),
S = c(10, 9.5, 12.2, 11, 8),
A = c(2, 1, 2, 4, 1),
Q = c('yes', 'no', 'yes', 'no', 'no')
)
print("Original dataframe:")
print(E)
L = split(E, seq(nrow(E)))
print("dataframe rows to a list:")
print(L)```
```

## OUTPUT

``` "Original dataframe:"
N    S A   Q
1   Jhon 10.0 2 yes
2  Hialy  9.5 1  no
3 Albert 12.2 2 yes
4  James 11.0 4  no
5  Delma  8.0 1  no
 "dataframe rows to a list:"
\$`1`
N  S A   Q
1 Jhon 10 2 yes

\$`2`
N   S A  Q
2 Hialy 9.5 1 no

\$`3`
N    S A   Q
3 Albert 12.2 2 yes

\$`4`
N  S A  Q
4 James 11 4 no

\$`5`
N S A  Q
5 Delma 8 1 no
```