A file which contains only one row of data is imported using np.genfromtxt() and is assigned to X. Which of the following is true?

Question

BlackTom AI · Accepted Answer

np.genfromtxt returns a NumPy ndarray, and when the input file contains a single row of numeric values it produces a 1-dimensional array whose shape is (N,) where N is the number of columns in that row.

1) Relevant knowledge points and concepts
- np.genfromtxt reads text data into a NumPy ndarray (not a Python list).
- NumPy arrays have a dimensionality (ndim) and shape. A single row with multiple entries becomes a 1D array with shape (N,), ndim == 1.
- To get an explicit 2D array from a single row you would need to reshape it or use functions like np.atleast_2d; genfromtxt by default does not wrap a single row into a 2D shape.

2) Step-by-step reasoning
- Suppose the file contains one line: "10 20 30".
- Calling X = np.genfromtxt('file.txt') reads those values into a NumPy array.
- The resulting X will look like array([10., 20., 30.]) and X.shape will be (3,), X.ndim will be 1.

3) Intermediate steps (conceptual)
- Read file -> parse whitespace-separated numbers -> create ndarray with one axis containing all parsed values -> resulting shape (N,).

4) Why the correct answer is correct
- The correct choice states X is a 1D array. That matches the behavior described above: a single row yields a 1-dimensional ndarray (one axis of length N). Genfromtxt does not automatically produce a nested or 2D Python structure for a single row.

5) Why the other options are incorrect
- a. "X is a list": incorrect because genfromtxt returns a NumPy ndarray, not a Python list.
- b. "X is a nested list": incorrect; the return type is not a nested Python list and there is no nesting for a single row.
- d. "X is a 2D array": incorrect by default — a single row yields a 1D array unless you explicitly reshape or request an extra dimension.

Conclusion: The correct answer is c. X is a 1D array, which matches the provided answer.

A file which contains only one row of data is imported using np.genfromtxt() and is assigned to X. Which of the following is true?Single choice

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