How to convert a list to data frame in R?

0 votes

I am new to R and I'm trying ti convert a list to data frame.

Consider a nested list of data. Length of the list is 145 and each item has a list of length of 30.

Is there any way to convert this structure into a data frame of 145 rows and 30 columns?

l <- replicate(
  145,
  list(sample(letters, 30)),
  simplify = FALSE
)
Apr 12, 2018 in Data Analytics by DataKing99
• 8,210 points
15,098 views

1 answer to this question.

0 votes

Let's assume your list of lists is called 'a':

data <- data.frame(matrix(unlist(a), nrow=145, byrow=T))

The above command will convert all character columns to factors. But, to avoid this add the stringsAsFactors parameters to this call.
Refer below:

data <- data.frame(matrix(unlist(a), nrow=145, byrow=T),stringsAsFactors=FALSE)

NOTE: You need to be careful here if all your data is not of same type.
When you pass the data through a matrix, all your data is coerced into a common type.
For Example: If you have one column of character data and one column of numeric data then the numeric data will be coerced to string by matrix() and both to factor by data.frame()

answered Apr 12, 2018 by nirvana
• 3,120 points

edited Apr 12, 2018 by nirvana

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