# How to Convert matrix to a list of column vectors in R ?

In this article, we will discuss how to convert a given matrix to a list of column vectors in R Programming Language. To do this we will take every column of the matrix and store that column in a list and at last print the list.

**It can be done in these ways:**

- Using the split() function
- Using list() with data.frame()

**Method 1: Using split() function:**

In this example to Convert a given matrix to a list of column vectors in R we use the split() function.

- The split() function is used to split the data according to our requirement.
- The arguments given in the split() function are data itself and the other one is rep() function
- The rep() function is used to replicates the data and in the rep() function we give one argument i.e. nrow() so, that the sequence is generated row-wise
- In nrow() function we give the data as an argument. “each = nrow()” is used to repeat this process for each row.

**Example:**

## R

`# create matrix` `M = ` `matrix` `(100:112, ncol=3)` `# print the matrix` `display` `(M)` `# create matrix to list off column vector` `l = ` `split` `(M, ` `rep` `(1:` `ncol` `(M), each = ` `nrow` `(M)))` `# print the list` `display` `(l)` |

**Output:**

**Method 2: using the list() function:**

In this example to Convert a given matrix to a list of column vectors in R we use the list() function

- The list() function is used with the “as.” command. This command is used to convert the object into a list and the object can be any kind of data structure i.e. data frame, matrix, vector, etc.
- The argument in the list() function is as.data.frame. So basically, what we are doing here is? At first, we convert a matrix into the data frame by using as.data.frame() then we convert that data frame into the list and at last, print that list.
- In our case what happens is as.list() takes every single column of the data frame and put every element of data frame’s column into a list, store that lists into “l” and prints the l.

## R

`# creating the matrix` `M = ` `matrix` `(100:112, ncol = 3)` `# print the matrix` `display` `(M)` `# as.list() is used to convert an object into list` `# as.data.frame() is used to convert as object into` `# data frame M is converted into the data frame then` `# that data frame is converted into the list` `l<-` `as.list` `(` `as.data.frame` `(M))` `# print the list` `display` `(l)` |

**Output: **