How To Turn Character Into Numeric In R?
How to Turn Character Into Numeric in R?
In R, data can be stored in different types of variables. The most common data types are character, numeric, and logical. Character variables store text values, numeric variables store numerical values, and logical variables store true or false values.
Sometimes, you may need to convert a character variable to a numeric variable. For example, you may have a column of data that contains the names of states, and you want to convert this column to a column of numerical values that represents the state abbreviations.
Converting a character variable to a numeric variable is a simple process. In this article, we will show you how to do this using the `as.numeric()` function.
We will also discuss some of the common problems that you may encounter when converting character variables to numeric variables, and we will provide some tips on how to avoid these problems.
So, if you are interested in learning how to turn character into numeric in R, then read on!
Step  Code  Explanation 

1. Use the as.numeric() function  as.numeric(“123”)  This function converts the character string “123” to the numeric value 123. 
2. Use the strtoi() function  strtoi(“123”)  This function converts the character string “123” to the integer value 123. 
3. Use the as.integer() function  as.integer(“123”)  This function converts the character string “123” to the integer value 123. 
In R, a character is a data type that represents a string of text. A numeric is a data type that represents a number. Sometimes, you may need to convert a character to a numeric. For example, you may have a column of data that contains customer names, and you want to create a new column that contains the customer ages. To do this, you would need to convert the customer names to numeric values.
There are a few different ways to convert characters to numerics in R. In this tutorial, we will discuss four methods:
 Using the `as.numeric()` function
 Using the `strtoi()` function
 Using the `as.integer()` function
 Using the `as.double()` function
Overview of the Problem
 What is a character?
A character is a data type that represents a string of text. In R, characters are enclosed in single or double quotes. For example, the following are all characters:
“Hello world”
‘Goodbye world’
 What is a numeric?
A numeric is a data type that represents a number. In R, numerics can be either integers or floatingpoint numbers. Integers are whole numbers, such as 1, 2, 3, and so on. Floatingpoint numbers are numbers that have a decimal point, such as 3.14159 or 2.71828.
 Why would you want to turn a character into a numeric?
There are a few reasons why you might want to turn a character into a numeric. For example, you might want to:
 Perform mathematical calculations on the data.
 Sort the data by numerical value.
 Create a scatter plot of the data.
Methods for Converting Characters to Numerics
There are a few different ways to convert characters to numerics in R. In this tutorial, we will discuss four methods:
 Using the `as.numeric()` function
 Using the `strtoi()` function
 Using the `as.integer()` function
 Using the `as.double()` function
Using the `as.numeric()` function
The `as.numeric()` function is the most straightforward way to convert a character to a numeric. The syntax of the `as.numeric()` function is as follows:
as.numeric(x)
where `x` is the character vector that you want to convert to a numeric vector.
For example, the following code converts the character vector `c(“1”, “2”, “3”)` to a numeric vector:
as.numeric(c(“1”, “2”, “3”))
Output:
[1] 1 2 3
Using the `strtoi()` function
The `strtoi()` function is another way to convert a character to a numeric. The syntax of the `strtoi()` function is as follows:
strtoi(x, base)
where `x` is the character vector that you want to convert to a numeric vector, and `base` is the base of the number system. The default value of `base` is 10, which means that the numbers are interpreted as decimal numbers.
For example, the following code converts the character vector `c(“1”, “2”, “3”)` to a numeric vector using the base 10:
strtoi(c(“1”, “2”, “3”), base = 10)
Output:
[1] 1 2 3
Using the `as.integer()` function
The `as.integer()` function is a specialized version of the `as.numeric()` function that only converts characters to integers. The syntax of the `as.integer()` function is as follows:
as.integer(x)
where `x` is the character vector that you want to convert to an integer vector.
For example, the following code converts the character vector `c(“1”, “2”, “3”)` to an integer vector:
as.integer(c(“1”, “2”, “3”))
Output:
[1] 1 2 3
Using the `as.double()` function
The `as.double()` function is a specialized version of the `as.numeric()` function that only converts characters to floatingpoint numbers. The syntax of the `as.double()` function is as follows:
as
How To Turn Character Into Numeric In R?
In R, there are a few different ways to turn a character into a numeric. The best way to do this will depend on the specific data you are working with.
1. Using the `as.numeric()` function
The `as.numeric()` function is the most straightforward way to convert a character to a numeric. To use this function, simply pass the character vector to the `as.numeric()` function. For example:
x < c("1", "2", "3") y < as.numeric(x) y [1] 1 2 3 2. Using the `strtoi()` function
The `strtoi()` function is a more specialized function that can be used to convert a character string to an integer. To use this function, pass the character string to the `strtoi()` function, along with the base of the number system. For example, to convert a character string to a decimal integer, you would use the following code:
x < c("1", "2", "3") y < strtoi(x, base = 10) y [1] 1 2 3 3. Using the `charToRaw()` and `rawToChar()` functions
The `charToRaw()` and `rawToChar()` functions can also be used to convert characters to numerics. To use these functions, you first need to convert the character vector to a raw vector using the `charToRaw()` function. Then, you can convert the raw vector to a character vector using the `rawToChar()` function. For example:
x < c("1", "2", "3") y < charToRaw(x) z < rawToChar(y) z [1] "1" "2" "3" 4. Using the `scan()` function
The `scan()` function can also be used to convert characters to numerics. To use this function, you first need to specify the delimiter that separates the numbers in the character vector. Then, you can pass the character vector to the `scan()` function. For example:
x < c("1,2,3") y < scan(x, sep = ",") y [1] 1 2 3 5. Using the `read.table()` function
The `read.table()` function can also be used to convert characters to numerics. To use this function, you first need to specify the delimiter that separates the numbers in the character vector. Then, you can pass the character vector to the `read.table()` function. For example:
x < c("1,2,3") y < read.table(text = x, sep = ",") y V1 1 1 2 2 3 3 6. Using the `read.csv()` function
The `read.csv()` function is a specialized version of the `read.table()` function that is designed for reading commaseparated values (CSV) files. To use this function, you simply need to pass the path to the CSV file to the `read.csv()` function. For example:
x < read.csv("data.csv") x V1 V2 1 1 2 2 3 4 3 5 6
Examples of Converting Characters to Numerics
1. Converting a single character to a numeric
To convert a single character to a numeric, you can use the `as.numeric()` function. For example, the following code converts the character “1” to a numeric 1:
x < "1" y < as.numeric(x) y [1] 1 2. Converting a vector of characters to a vector of numerics
To convert a vector of characters to a vector of numerics, you can use the `as.numeric()` function. For example, the following code converts the vector of characters c(“1”, “2”, “3”) to a vector of numerics c(1, 2, 3):
x <
How do I turn a character into a numeric in R?
There are a few ways to turn a character into a numeric in R. The simplest way is to use the `as.numeric()` function. For example, to convert the character string “123” to a numeric value, you would use the following code:
x < as.numeric("123") You can also use the `strtoi()` function to convert a character string to an integer. For example, to convert the character string "123" to an integer, you would use the following code: x < strtoi("123") Finally, you can use the `as.integer()` function to convert a character string to an integer. For example, to convert the character string "123" to an integer, you would use the following code: x < as.integer("123") What if the character string contains nonnumeric characters?
If the character string contains nonnumeric characters, the `as.numeric()`, `strtoi()`, and `as.integer()` functions will throw an error. To avoid this error, you can use the `gsub()` function to remove all nonnumeric characters from the character string. For example, to convert the character string “123a” to a numeric value, you would use the following code:
x < gsub("[^09]", "", "123a") What if I want to preserve the original character string?
If you want to preserve the original character string, you can use the `as.character()` function. For example, to convert the numeric value 123 to a character string, you would use the following code:
x < as.character(123) Can I use a vector of character strings?
Yes, you can use a vector of character strings with the `as.numeric()`, `strtoi()`, and `as.integer()` functions. For example, to convert the vector of character strings c(“123”, “456”, “789”) to a vector of numeric values, you would use the following code:
x < as.numeric(c("123", "456", "789")) What are the advantages and disadvantages of each method?
The `as.numeric()` function is the most straightforward way to convert a character string to a numeric value. However, it does not handle nonnumeric characters well. The `strtoi()` and `as.integer()` functions are more robust to nonnumeric characters, but they can only convert a character string to an integer. The `as.character()` function is the best way to preserve the original character string.
Which method should I use?
The best method to use depends on your specific needs. If you need to convert a character string to a numeric value and you do not have any nonnumeric characters, the `as.numeric()` function is the best option. If you need to convert a character string to a numeric value and you have nonnumeric characters, the `strtoi()` or `as.integer()` functions are better options. If you need to preserve the original character string, the `as.character()` function is the best option.
In this article, we have discussed how to convert a character vector to a numeric vector in R. We have seen that there are several ways to do this, depending on the specific situation. We have also seen how to deal with missing values and errors. Finally, we have provided some tips on how to choose the best method for your particular needs.
We hope that this article has been helpful. Please feel free to contact us if you have any questions or need further assistance.
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