randRange(1, 4) randRange(1, 4) makeMatrix(randRange(-2, 4, DIM_1, DIM_2)) "\\textbf " + randFromArray("ABCDEF") printSimpleMatrix(MAT_A)

PRETTY_MAT_ID = PRETTY_MAT_A

What are the dimensions of matrix PRETTY_MAT_ID?

DIM_1 \times DIM_2

The first dimension is the number of rows in the matrix. PRETTY_MAT_ID has DIM_1 rows.

The second dimension is the number of columns in the matrix. PRETTY_MAT_ID has DIM_2 columns.

So, PRETTY_MAT_ID is a DIM_1 \times DIM_2 matrix.