R: Create 30 New Variables in a Data Frame

To create 30 new variables in a data frame in R, you can use the following code:

# Create an empty data frame
df <- data.frame()

# Create 30 new variables
for (i in 1:30) {
  var_name <- paste0('var', i)  # Name of the variable
  var_values <- rnorm(nrow(df)) # Generate random values for the variable
  df[var_name] <- var_values    # Add the variable to the data frame
}

In this code, an empty data frame 'df' is created. Then, a loop is used to generate and add 30 new variables ('var1', 'var2', ..., 'var30') to the data frame. The 'var_name' variable stores the name of each new variable, and the 'var_values' variable generates random values for each variable using the 'rnorm()' function. Finally, the new variable is added to the data frame using the variable name as the column name.