The command format long e; in MATLAB (or similar environments like Octave) is used to display floating-point numbers in long scientific notation. Specifically, it increases the precision of the output to 15 digits for double-precision values and uses exponential notation (i.e., $a \times 10^n$) to represent the number.

Would you like more details or have any questions?

Here are 5 related questions to expand on this topic:

1. How does format short e differ from format long e in MATLAB?
2. What is the default format for displaying numbers in MATLAB?
3. How does floating-point precision affect numerical computations?
4. What is the difference between double and single precision in numerical formats?
5. Can you explain how MATLAB handles floating-point rounding errors?

Tip: Using format long can help reveal small numerical errors in computations that may be hidden in shorter displays!