rbind.data.frame
Create a Data Frame from Rows
Description
Creates a data frame from rows.
Usage
rbind.data.frame(..., deparse.level = 1)
Arguments
| ... |
individual data frames or vectors.
|
| deparse.level |
This argument is not used in rbind.data.frame at present.
|
Value
returns a data frame combining the arguments by rows.
Hints
This is a method for the generic function rbind() for objects
that inherit from class "data.frame".
If none of the arguments is a data frame, you must call the
method explicitly, rather than by calling rbind().
The arguments should be either compatible data frames (with the
same set of variables) or lists whose elements are suitable
to be added onto the corresponding variables in a data frame argument.
The first data frame encountered as an argument determines the
form of the output. That is, the result of the function is a data
frame whose variables are factors, ordered factors, numeric variables,
and other kinds of variables according to what is found in the
first data frame argument encountered.
Warning
This method is not a very efficient way to build a data frame in
the case where many rows are added in a loop. It does a lot of
checking and re-computing for each loop. The following alternatives
are faster:
- Write the rows to a file and use read.table() to read
them in.
- Form a matrix (usually of mode character), and then
convert it with as.data.frame().
- Develop the individual variables, and then bind them together
with data.frame().
See Also
Examples
df <- data.frame(a = c(1:5), b = (1:5)^2)
# add 2 new rows
rbind(df, c(2, 3), c(5, 6))
rbind.data.frame()
rbind(df, matrix(c(2, 3, 5, 6), nrow =2))
# Error: names do not match previous names
rbind(df,
matrix(c(2, 3, 5, 6), nrow = 2, dimnames = list(NULL, c("a", "b"))))
# OK.
rbind(matrix(c(2, 3, 5, 6), nrow = 2,
dimnames = list(NULL, c("a", "b"))), c(12, 34), df)
# Insert three rows before df
df1 <- data.frame(a = c("Red", "Green","Blue","White","Black"),
b = (1:5)^2)
rbind(df1, data.frame(a = "Yellow", b = 36)) # add one row
rbind(df1, data.frame(a = c("Yellow","Pink"), b= c(36,49)))
# add two rows
rbind(df1, data.frame(aa = c("Yellow","Pink"), bb= c(36,49)))
# Error: names do not match previous names
rbind(df1, c("Yellow", 36))
# Warning: invalid factor level, NAs generated.
rbind(df1, c("Yellow", "36"))
# Warning: invalid factor level, NAs generated.
rbind(df1, list(a = c("Yellow","Pink"), b= c(36,49)))
# Warning: invalid factor level, NAs generated.