Texas Instruments TI-82 User Manual - Page 134
Defining a Matrix
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Defining a Matrix A matrix is a two-dimensional array. You can display, enter, or edit a matrix in the matrix editor. The TI.82 has five matrix variables: ãAä, ãBä, ãCä, ãDä, or ãEä. You can define a matrix directly in an expression. Selecting a Matrix To define or display a matrix in the editor, you first must select the name of the matrix. 1. Press ~ ~ to display the MATRX EDIT menu. 2. Select the matrix you want to define (either ãAä, ãBä, ãCä, ãDä, or ãEä). The MATRX EDIT screen appears. Accepting or Changing Matrix Dimensions The dimensions of the matrix (row × column) are displayed on the top line. When you select a matrix to define, the cursor is on the row dimension. You must accept or change the dimensions each time you enter or edit a matrix. A "new" matrix has dimension 1×1. 1. Accept or change the number of rows. ¦ To accept the number, press Í. ¦ To change the number, enter the number of rows (up to 99), and then press Í. The cursor moves to the number of columns. 2. Accept or change the number of columns as above. The rectangular cursor moves to the first matrix element. 10-4 Matrices
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