# Convert Character to Numeric in R (With Examples)

In this tutorial, we will look at how to convert a character type field (for example, a vector or a dataframe column) to a numeric type in R.

## How to convert character type data to numeric in R?

You can use the `as.numeric()` function in R to convert character type to numeric type in R. Pass the field (for example, a vector) as an argument to the function. The following is the syntax –

`as.numeric(x)`

If you pass a vector to the above function, it returns a vector with each value in numeric type.

## Examples

Let’s now look at some examples of using the `as.numeric()` function in R.

### Convert character type vector to numeric type vector

Let’s create a vector with numbers as character type values and then apply the `as.numeric()` function.

```# create a vector
vec <- c('1', '2', '3', '4')
# convert to numeric
vec <- as.numeric(vec)
# display the vector
print(vec)
# display vector's type
print(class(vec))```

Output:

``` 1 2 3 4
 "numeric"```

The resulting vector has numeric values.

Note that this method will not work if the character type values cannot be converted to numeric type. For example, “a”

```# create a vector
vec <- c('a', 'b', 'c', 'd')
# convert to numeric
vec <- as.numeric(vec)
# display the vector
print(vec)
# display vector's type
print(class(vec))```

Output:

```Warning message in eval(expr, envir, enclos):
“NAs introduced by coercion”
 NA NA NA NA
 "numeric"```

We get a vector of `NA` values and a warning. This is because the original values from the vector cannot be converted to numeric.

### Convert character type dataframe column to numeric type

You can also use the `as.numeric()` function to change the data type of a dataframe column in R to numeric.

Let’s look at an example.

First, we will create a dataframe with the height and weight information of some students in a university.

```# create a data frame
df <- data.frame(
"Height"= c("168", "174", "162", "158"),
"Weight"= c(73, 81, 65, 55)
)

# display the dataframe
print(df)```

Output:

```   Name Height Weight
1   Tim    168     73
2 Hasan    174     81
4 Maria    158     55```

You can see that the “Height” column in the above dataframe is of character type. Let’s change its type to numeric type using the `as.numeric()` function.

```# convert "Height" column to numeric type
df\$Height <- as.numeric(df\$Height)

# display "Height" column's type
print(class(df\$Height))```

Output:

` "numeric"`

You can see that the “Height” column is now of numeric type.

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