The **cbind()** and **rbind() **functions are generic methods for data frames. These data frame functions will be used if at least one argument is a data frame and the other are vectors or matrices. To merge two data frames (datasets) horizontally, use the **merge()** function in the R language.

**cbind in R**

The **cbind()** is a **built-in R **function that takes a sequence of vector, matrix, or data-frame as arguments and combines them by columns. The cbind() function stands for column-bind.

In the default method, all the vectors/matrices must be atomic vectors or lists. Expressions are not allowed.

**Syntax**

`cbind(a1, a2, ..., deparse.level = 1)`

**Parameters**

The cbind() function takes a1, a2, which takes vectors, matrices, and/or data frames.

**deparse**.**level**: for non-matrix, 0 constructs no labels, 1 or 2 constructs labels from the argument names.

**Implementing the cbind() function in R**

The cbind() function takes a sequence of vector, matrix, or data frame arguments and combines them by columns or rows.

```
df <- data.frame(c1 = c(1, 2, 3, 4),
c2 = c(5, 6, 7, 8),
c3 = c(9, 10, 11, 12))
df
c4 <- c(18, 19, 20, 21)
cat("After adding a column using cbind()", "\n")
newDf <- cbind(df, c4)
newDf
```

**Output**

```
c1 c2 c3
1 1 5 9
2 2 6 10
3 3 7 11
4 4 8 12
After adding a column using cbind() function
c1 c2 c3 c4
1 1 5 9 18
2 2 6 10 19
3 3 7 11 20
4 4 8 12 21
```

In this example, we created a data frame using three vectors and then add a fourth vector as a column to the original data frame using the cbind() function. In the final data frame, we can see that the c4 column is added.

**Combine two data frames by columns using cbind()**

To combine two data frames by columns, use the **cbind() **function. The cbind() data frame function is just a wrapper for data.frame(…, check.names = FALSE). This means it will split matrix columns in data frame arguments and convert character columns to factors unless **stringsAsFactors = FALSE** is specified.

The data frame method will be used if at least one argument is a data frame and the rest are vectors or matrices.

Let’s create a second data frame and use the **cbind()** function to merge the second data frame to the first data frame.

```
df <- data.frame(c1 = c(1, 2, 3, 4),
c2 = c(5, 6, 7, 8),
c3 = c(9, 10, 11, 12))
df
df2 <- data.frame(c4 = c(18, 19, 20, 21),
c5 = c(29, 46, 47, 37))
df2
cat("After adding another data frame using cbind()", "\n")
newDf <- cbind(df, df2)
newDf
```

**Output**

```
c1 c2 c3
1 1 5 9
2 2 6 10
3 3 7 11
4 4 8 12
c4 c5
1 18 29
2 19 46
3 20 47
4 21 37
After adding another data frame using cbind()
c1 c2 c3 c4 c5
1 1 5 9 18 29
2 2 6 10 19 46
3 3 7 11 20 47
4 4 8 12 21 37
```

You can see that both data frame’s row count is the same, and that is why it merges perfectly, but if the row counts of both columns are different, it will give us the error.

This is because the deparse.level value defines how the column names are generated. The default value of deparse.level is 1.

```
df <- data.frame(c1 = c(1, 2, 3, 4),
c2 = c(5, 6, 7, 8),
c3 = c(9, 10, 11, 12))
df2 <- data.frame(c4 = c(18, 19, 20, 21, 6),
c5 = c(29, 46, 47, 37, 10))
cat("After adding another data frame using cbind()", "\n")
newDf <- cbind(df, df2)
newDf
```

**Output**

```
After adding another data frame using cbind()
Error in data.frame(..., check.names = FALSE) :
arguments imply differing number of rows: 4, 5
Calls: cbind -> cbind -> data.frame
Execution halted
```

We got this error: `arguments imply differing number of rows: 4, 5`

If the number of rows of the two data frames differs, the cbind() function cannot be used.

**Using cbind() function with Multiple Columns**

The cbind() function can also be applied to multiple columns and data objects. For example, define a data frame using three columns and add the two columns to that data frame using the cbind() function, and see the output.

```
df <- data.frame(c1 = c(1, 2, 3, 4),
c2 = c(5, 6, 7, 8),
c3 = c(9, 10, 11, 12))
c4 <- c(18, 19, 20, 21)
c5 <- c(29, 46, 47, 37)
cat("After adding multiple columns using cbind()", "\n")
newDf <- cbind(df, c4, c5)
newDf
```

**Output**

```
After adding multiple columns using cbind()
c1 c2 c3 c4 c5
1 1 5 9 18 29
2 2 6 10 19 46
3 3 7 11 20 47
4 4 8 12 21 37
```

**Conclusion**

The cbind() function, short for column bind, is a merge function that can combine two data frames with the same number of multiple rows into a single data frame.

That is it for the cbind function in R.