*53*

The **seq()** function in R can be used to generate a sequence of numbers.

This function uses the following basic syntax:

**seq(from=1, to=1, by=1, length.out=NULL, along.with=NULL)**

where:

**from**: The starting value of the sequence.**to**: The end value of the sequence.**by**: The value to increment by. Default is 1.**length.out**: The desired length of the sequence.**along.with:**The desired length that matches the length of this data object.

The following examples show how to use this function to generate sequences of numbers in practice.

**Example 1: Generate Sequence Starting from One**

The following code shows how to generate a sequence of values from 1 to 20:

#define sequence x #view sequence x [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

**Example 2: Generate Sequence with Specific Start and End Values**

The following code shows how to generate a sequence of values from 5 to 15:

#define sequence x #view sequence x [1] 5 6 7 8 9 10 11 12 13 14 15

**Example 3: Generate Sequence with Custom Incrementing**

The following code shows how to generate a sequence of values from 0 to 20, incrementing by **4**:

#define sequence x #view sequence x [1] 0 4 8 12 16 20

**Example 4: Generate Sequence with Specific Length**

The following code shows how to generate a sequence of values from 0 to 20, where the specified length of the sequence is **4**:

#define sequence x out=4) #view sequence x [1] 0.000000 6.666667 13.333333 20.000000

**Example 5: Generate Sequence with Length Based on Some Data Object**

The following code shows how to generate a sequence of values from 0 to 20, where the specified length of the sequence should match the length of another data object:

#define vectoryy #define sequencex, make sure length matches the length ofyx with=y) #view sequence x [1] 0.000000 6.666667 13.333333 20.000000

Notice that sequence *x* goes from 0 to 20 and its length (4) matches the length of vector *y*.

**Additional Resources**

How to Use the sample() Function in R

How to Use the dist() Function in R

How to Use the table() Function in R