How do you concatenate two matrices in MATLAB?

The correct answer is based on the method commonly used in MATLAB for matrix concatenation. When you have two matrices, you can combine them into a larger matrix either horizontally or vertically.

For horizontal concatenation, you use the syntax [A, B]. This places matrix B to the right of matrix A, provided that they have the same number of rows. Similarly, for vertical concatenation, the syntax [A; B] is used. This stacks matrix B below matrix A, as long as they have the same number of columns.

Therefore, combining both syntaxes, you can concatenate matrices either horizontally or vertically using the respective notation. This flexibility allows for a variety of matrix configurations in MATLAB, making it a powerful tool for matrix manipulation. The reason this answer correctly encapsulates the concept is that it acknowledges both methods of concatenation in a clear and concise manner.