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20. Juli 2023 · Sie können den Dollarzeichenoperator ( $) in R verwenden, um Variablen in Listen und Datenrahmen zu erstellen und darauf zuzugreifen. Die folgenden Beispiele zeigen vier gängige Möglichkeiten, diesen Operator in der Praxis zu verwenden.
- Example 1: Use Dollar Sign to Create Variable in List
- Example 2: Use Dollar Sign to Access Variable in List
- Example 3: Use Dollar Sign to Create Variable in Data Frame
- Example 4: Use Dollar Sign to Access Variable in Data Frame
- Additional Resources
Suppose we create the following list in R: We can use the dollar sign operator ($) to create a new variable in this list: Notice that the new variable Dhas been added to the list.
We can also use the dollar sign operator ($) to access a specific variable in a list. For example, we can use the following code to access the variable Cin the list: Notice that only the values for variable Care returned.
Suppose we create the following data frame in R: We can use the dollar sign operator ($) to create a new variable in the data frame called assists: Notice that the new variable assistshas been added to the data frame.
We can also use the dollar sign operator ($) to access a specific variable in a data frame. For example, we can use the following code to access the pointsvariable in the data frame: Notice that only the values for the pointsvariable are returned.
The following tutorials explain how to use other common functions in R: How to Use the View() Function in R How to Use the aggregate() Function in R How to Use the replace() Function in R
The first form, [, can be used to extract content from vectors, lists, or data frames. The second and third forms, [[ and $, extract content from a single object. The $ operator uses a name to perform the extraction as in anObject$aName. Therefore it enables one to extract items from a list based on their names.
2. Jan. 2021 · Requirements. Using $ in R on a List. Example 1: Using the $ Operator to Add a New Variable to a List. Example 2: How to use the $ Operator to Select a Variable in a List. Example 3: How to Select an Object containing White Spaces using $ in R. How to use $ in R on a Dataframe. Example 4: Using $ to Add a new Column to a Dataframe.
In R, one of the fundamental operators is the dollar sign operator ( $ ). With the $ operator, you can access a specific part of data. The most notable use cases for the $ operator are related to lists and dataframes: With lists, you can use the $ operator to access a particular variable of the list.
10. Jan. 2022 · How to use the dollar sign in R, You’ll learn how to use the $ operator in the R programming language in this tutorial. Example 1: How to use the dollar sign in R…. To read more visit How to use the dollar sign ($) in R.
conditions = c("Bas_A", "Bas_T", "Oper_A", "Oper_T") # the vector characters correspond to the target column names in my_data. for (cond in conditions){. for (i in 1:n){. new_data <- rbind(new_data, c(cond, my_data$cond[i])) } }
