When a factor is converted into a numeric vector the numeric codes corresponding to the factor levels will be returned. To get the sapply to do what i assume you want to do you can do the following.

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To transform a factor f to its original numeric values as numeric levels f f is recommended and slightly more efficient than as numeric as character f.

R factor to numeric. Your sapply call is applying fun across all values of x when you really want it to be applying across all values of i. In the following i m therefore going to explain how to convert a factor vector to numeric properly. Before we can start we need to create an example factor vector in r.

To convert a factor to numeric in r can be a tricky task. However if you need some more explanations for the conversion of data types you might have a look at the following video of my youtube channel. Others have shown how to apply this to a single column in a data frame or to multiple columns in a data frame.

Use as numeric to convert a factor to a numeric vector. This is faq 7 10. For example east corresponds to 1 north corresponds to 2 and so forth.

Quoting directly from the help page for factor. That s basically how to apply the as numeric function in r. Convert one variable of data frame to numeric.

The previous code converts our factor variable to character first and then it converts the character to numeric. Sapply x 1 length x fun fun x. Note that this will return the numeric codes that correspond to the factor levels.

The factor is converted into a numeric vector using as numeric. X num as numeric x convert string to numeric in r x num print converted x to the console 8 7 5 8 2 5 2 5 2 7 7 7 7. For this task we can use the following r code.

To transform a factor f to approximately its original numeric values as numeric levels f f is recommended and slightly more efficient than as numeric as character f. Double is the name of the type. The factor command is used to create and modify factors in r.

Numeric is the name of the mode and also of the implicit class. Recursive function to give groups of consecutive numbers. To ensure that as numeric and as double remain identical s4 methods can only be set for as numeric.

It is a historical anomaly that r has two names for its floating point vectors double and numeric and formerly had real. As numeric directions factor 1 2 1 3 3. In the first example i m going to convert only one variable to numeric.

Be very careful when you convert factors with numeric levels to a numeric vector.