Describe a situation where you had to use a for loop in R for a complex data processing task. How did you ensure the loop executed efficiently?
- Processing each row of a large dataset
- Filtering and transforming data in a nested structure
- Iterating over multiple dimensions of an array
- All of the above
One situation where a for loop in R may be used for a complex data processing task is when you need to filter and transform data in a nested structure, such as a list of lists. To ensure efficiency, you can optimize the loop by preallocating the output structure, using vectorized operations within the loop, and minimizing unnecessary computations or redundant checks.
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