Texas Instruments TI-84 PLUS SILV Guidebook - Page 152
Defining a Matrix, What Is a Matrix?
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4. Press 2 Í 3 Í 3 Í to complete the first row for X + 2Y + 3Z = 3. 5. Press 2 Í 3 Í 4 Í 3 Í to enter the second row for 2X + 3Y + 4Z = 3. 6. Press y 5 to return to the home screen. If necessary, press ' to clear the home screen. Press y ~ to display the MATRX MATH menu. Press } to wrap to the end of the menu. Select B:rref( to copy rref( to the home screen. 7. Press y 1 to select 1: [A] from the MATRX NAMES menu. Press ¤ Í. The reduced row-echelon form of the matrix is displayed and stored in Ans. 1X N 1Z = L3 therefore 1Y + 2Z = 3 therefore X = L3 + Z Y = 3 N 2Z Defining a Matrix What Is a Matrix? A matrix is a two-dimensional array. You can display, define, or edit a matrix in the matrix editor. You can also define a matrix using the MTRX shortcut menu (t `).The TI-84 Plus has 10 matrix variables, [A] through [J]. You can define a matrix directly in an expression. A matrix, depending on available memory, may have up to 99 rows or columns. You can store only real numbers in TI-84 Plus matrices. Fractions are stored as real numbers and can be used in matrices. Selecting a Matrix Before you can define or display a matrix in the editor, you first must select the matrix name. To do so, follow these steps. 1. Press y | to display the MATRX EDIT menu. The dimensions of any previously defined matrices are displayed. 2. Select the matrix you want to define. The MATRX EDIT screen is displayed. Chapter 10: Matrices 145