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Apple decided to sell 4 types of computers based on a simple 2x2 product matrix: 2 user types(Professional vs Consumer) and 2 types of machines (Desktop vs Portable). Consumer Portable Consumer Desktop Professional Portable Professional Desktop
Ask Ben 10
Press 2ND MATRIX (above x-1). Select EDIT at the top with the arrow keys. The select matrix [B] and press ENTER. You can now edit the matrix. (Use the numbers at the upper right to set the size.)
Use the column matrix, [ -1 ] [ 3 ]
ya yes its there a matrix called zero matrix