Create empty DataFrame with only column names in R
In this article, we are going to create an empty data frame with column names in the R programming language.
The basic syntax for creating a data frame is using data.frame().
Syntax: data.frame(input_data,nrow,ncol)
Parameter:
- input_data may be values ot list or vector.
- nrow specifies the number of rows
- ncol specifies the number of columns.
Steps –
- Create an empty dataframe
- Define the column names to a variable
- Assign that variable to the dataframe.
- Display data frame so created
We can assign column names to dataframe by using colnames()
Syntax:
colnames(dataframe_name)
Given below is the implementation using the above approach.
Example 1:
R
# created vector with 5 characterscolumns= c("id","names","address","phone","aadhar no") # pass this vector length to ncol parameter# and nrow with 0myData = data.frame(matrix(nrow = 0, ncol = length(columns))) # assign column namescolnames(myData) = columns # displayprint(myData) |
Output:
[1] id names address phone aadhar no
<0 rows> (or 0-length row.names)
If we specify nrow parameter with morethan 0, it will take NA as that many rows.
Example 2:
R
# created vector with 5 characterscolumns= c("id","names","address","phone","aadhar no") # pass this vector length to ncol parameter # and nrow with 1myData = data.frame(matrix(nrow=1, ncol = length(columns))) # assign column namescolnames(myData) = columns # displayprint(myData) # pass this vector length to ncol parameter and # nrow with 6myData = data.frame(matrix(nrow=6, ncol = length(columns))) # assign column namescolnames(myData) = columns # displayprint(myData) |
Output:
id names address phone aadhar no
1 NA NA NA NA NA
id names address phone aadhar no
1 NA NA NA NA NA
2 NA NA NA NA NA
3 NA NA NA NA NA
4 NA NA NA NA NA
5 NA NA NA NA NA
6 NA NA NA NA NA
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