Essentials for the TI-83+ 1Essentials for the TI-83+Special Keys.yPress and release, then press the appropriate key to access the 2nd(yellow) operation.Press and release to access characters and letters indicated above thekeys. The sequence ysets the ALPHA-lock.¿Stores answers, matrices, quantities, etc. into variable namesy[The calculator will display your last entry. To recall the last entryyou pressy[, to recall the second to last entry press: y[y[,and so on.yZThe calculator will display the last answer.ÍDisplays the last answer in fractions, if possible.Entering Matrices. There are several ways to enter matrices in the TI-83+. One method consists ofentering the matrix directly as an expression, while another method is through the use of the matrix editorfound in the y[EDIT]menu. Below are examples that illustrate the creation of matrices andvectors using these methods. On the TI-83+, a (column) vector is simply an n×1 column matrix. Foradditional information, consult the TI-83+ Guidebook.Direct Entry. Begin a matrix with a square bracket, and each row of the matrix with a matching pair ofsquare brackets; separate the entries in the rows with commas. Figure 1 below shows how you can enterthe matrix 123456éëêùûúdirectly and assign to it the name [A] from the y[EDIT]menu. Thesymbol !appears after pressing the ¿key.Figure 1: [A] entered directly.The Matrix Editor. Press y[EDIT]. The editor allows you to create a matrix by specifying avariable name, a size—row size and column size—and the entries of the matrix. After choosing [EDIT],a screen such as Figure 2 (on the following page) will appear. Select a name by pressing Íon aparticular matrix, input rows, columns, and entries, your screen should be similar to Figure 3 (on thefollowing page). To view the matrix from the home screen, press y5to return home, and thenchoose yand select the matrix. You can create vectors in a similar fashion. Simply enter vectorsin as n×1 column matrices.
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