What is a list inside a list commonly referred to in programming?

What is a list inside a list commonly referred to in programming?

• A. Matrix
• B. List of lists
• C. 2D array
• D. Nested array

Answer: (C)

A list inside a list is commonly referred to as a 2D array. This structure allows for the organization of data in a tabular format, resembling a grid or a matrix, where each element can be accessed using two indices—one for the row and another for the column. In Python, a list of lists allows for this functionality, with each sublist representing a row of data. The reason this is termed a 2D array is that it represents two dimensions of data, making it ideal for applications such as handling images, matrices in mathematics, or any situation where data is best understood in rows and columns, similar to an Excel spreadsheet. While "list of lists" also describes this structure accurately, it is more of a descriptive term rather than a formal classification. On the other hand, "matrix" typically applies in mathematical contexts and may not universally encompass all programming instances, especially outside of mathematical frameworks. Nested array is a more generalized term and could refer to deeper levels of nesting beyond just two dimensions. Thus, referring to it as a 2D array is precise in contexts where data is structured in two dimensions, aligning with both the naming conventions in computer science and mathematical terminologies.

A list inside a list is commonly referred to as a 2D array. This structure allows for the organization of data in a tabular format, resembling a grid or a matrix, where each element can be accessed using two indices—one for the row and another for the column. In Python, a list of lists allows for this functionality, with each sublist representing a row of data.

The reason this is termed a 2D array is that it represents two dimensions of data, making it ideal for applications such as handling images, matrices in mathematics, or any situation where data is best understood in rows and columns, similar to an Excel spreadsheet.

While "list of lists" also describes this structure accurately, it is more of a descriptive term rather than a formal classification. On the other hand, "matrix" typically applies in mathematical contexts and may not universally encompass all programming instances, especially outside of mathematical frameworks. Nested array is a more generalized term and could refer to deeper levels of nesting beyond just two dimensions.

Thus, referring to it as a 2D array is precise in contexts where data is structured in two dimensions, aligning with both the naming conventions in computer science and mathematical terminologies.