Data Frame Manipulation in R
Instruction: Write a command to add a new column to a data frame that calculates the logarithm of an existing column 'A'.
Context: This question checks the candidate's proficiency with basic data frame operations in R. Adding computed columns is a common task in data preparation and analysis, and familiarity with such operations is crucial for efficient data handling.
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First, to address the question directly, the command to add a new...