Casio FX-991ES User Guide - Page 59
Matrix Calculations - matrix multiplication
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• In the case of simultaneous linear equations, you can use f and c to switch the display between the solutions for X and Y (and Z). • When there are multiple solutions for a quadratic or cubic equation, you can use the f and c keys to scroll the display between X1, X2, and X3. The actual number of solutions depends on the equation. • Pressing A while a solution is displayed will return to the coefficient editor screen. • The display format of solutions is in accordance with the input/ output format and complex number display format settings of the calculator's setup screen. • Note that you cannot transform values to engineering notation while an equation solution is displayed. Appendix Equation Calculation: to Matrix Calculations (MATRIX) You can save matrices under the names "MatA", "MatB", and "MatC" in matrix memory. Matrix calculation results are stored in a special Matrix Answer Memory named "MatAns". All calculations in this section are performed in the MATRIX Mode (N6). k Creating and Managing a Matrix Creating a Matrix and Storing It in Matrix Memory (1) In the MATRIX Mode, press 14(MATRIX)1(Dim). • This displays the matrix selection screen. • Note that the matrix selection screen also appears whenever you enter the MATRIX Mode. (2) Press a number key (1, 2, or 3) to specify the name of the matrix you want to select. • This displays a screen for configuring dimension settings. c f E-57