select columns from a df in r

You can select columns from a data.frame in R by using indexing or subsetting. Here are some examples:

Using the dollar sign and column name:


main.r
df$column_name
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Using column index with brackets:


main.r
df[, column_index]
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Using column name with brackets:


main.r
df[, "column_name"]
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Using column names with brackets:


main.r
df[, c("column1", "column2", "column3")]
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Example:


main.r
# create a sample data frame
df <- data.frame(name = c("John", "Jane", "Alice"),
                 age = c(25, 30, 35),
                 salary = c(50000, 60000, 70000),
                 gender = c("male", "female", "female"))

# select the age and gender columns
age_gender <- df[, c("age", "gender")]
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In this example, we created a data frame with columns "name", "age", "salary", and "gender". We then used column names "age" and "gender" to create a new data frame age_gender that contains only these two columns.

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