R Program to extract or replace parts of a factor

March 9, 2022, Learn eTutorial
1030

How to extract the five of the levels of factor created from a random sample from the LETTERS

Here we are explaining how to write an R program to extract the five of the levels of factor created from a random sample from the LETTERS. Here we are using a built-in function factor() for this conversion. The vector values are passed to these functions directly here. The factor() functions in R computes the factors of the vector in a single function.

Using the function factor() we can create a factor of the vector. Factors are stored as integer vectors and which is closely related to vectors. The syntax of these functions are

``````
factor(x = character(), levels, labels = levels,exclude = NA, ordered = is.ordered(x), nmax = NA)
#Where x is a vector of data, usually taking a small number of distinct values
```
```

How to extract the levels of factor created from random samples in the R Program

Below are the steps used in the R program to extract the levels of factors created from random samples. In this R program, we directly give the values to built-in functions. And print the function result. Here we used variable Let for holding sample data and variable fac for finding the factors of the given data. Print the resulting factors.

ALGORITHM

STEP 1: Assign variable Let with sample data

STEP 2: First print original data values

STEP 3:Call the built-in function factor as fac = factor(Let)

STEP 4: Assign variable fac with the function result

STEP 5: Find the 5 levels as Let[1:5]

STEP 6: Give a table view for the result factors as table(Let[1:5])

R Source Code

```                                          ```Let = sample(LETTERS,size=50,replace=TRUE)
print("Original data:")
print(Let)
fac = factor(Let)
print("Original factors:")
print(fac)
print("Five of the levels")
print(table(Let[1:5]))```
```

OUTPUT

```[1] "Original data:"
[1] "H" "N" "O" "D" "L" "E" "H" "U" "W" "W" "S" "Q" "A" "O" "I" "G" "G" "W" "T"
[20] "Z" "I" "S" "B" "P" "I" "F" "L" "B" "X" "A" "J" "V" "X" "C" "U" "A" "C" "W"
[39] "D" "J" "X" "C" "U" "O" "F" "V" "Y" "Z" "W" "Z"
[1] "Original factors:"
[1] H N O D L E H U W W S Q A O I G G W T Z I S B P I F L B X A J V X C U A C W
[39] D J X C U O F V Y Z W Z
Levels: A B C D E F G H I J L N O P Q S T U V W X Y Z
[1] "Five of the levels"

D H L N O
1 1 1 1 1   ```

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