Final answer:
To create a new column 'is large animal' in a data frame to indicate if an animal weighs more than 199 kilograms, a one-line code snippet using the pandas library would be: zoo_records['is_large_animal'] = zoo_records['weight'] > 199. This will create a boolean column reflecting the condition.
Step-by-step explanation:
A data analyst who is working with a data frame in a programming environment like Python can create a new column is large animal by writing a code that includes conditional logic. This can be achieved using the pandas library, which provides powerful data manipulation tools. The following code snippet assumes the analyst is using pandas and shows how to create the new column based on the condition if an animal's weight is more than 199 kilograms:
zoo_records['is_large_animal'] = zoo_records['weight'] > 199
This code will result in a boolean column where each row has True if the animal's weight is over 199 kilograms, and False otherwise.