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TI-83_TI-86_and_TI-89

# TI-83_TI-86_and_TI-89 - Essentials for the TI-83 Special...

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Essentials for the TI-83+ 1 Essentials for the TI-83+ Special Keys. y Press and release, then press the appropriate key to access the 2nd (yellow) operation. Press and release to access characters and letters indicated above the keys. The sequence y sets the ALPHA-lock. ¿ Stores answers, matrices, quantities, etc. into variable names y [ The calculator will display your last entry. To recall the last entry you press y [ , to recall the second to last entry press: y [ y [ , and so on. y Z The calculator will display the last answer. Í Displays the last answer in fractions, if possible. Entering Matrices. There are several ways to enter matrices in the TI-83+. One method consists of entering the matrix directly as an expression, while another method is through the use of the matrix editor found in the y [EDIT] menu. Below are examples that illustrate the creation of matrices and vectors using these methods. On the TI-83+, a (column) vector is simply an n × 1 column matrix. For additional 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 of square brackets; separate the entries in the rows with commas. Figure 1 below shows how you can enter the matrix 1 2 3 4 5 6 é ë ê ù û ú directly and assign to it the name [A] from the y [EDIT] menu. The symbol ! 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 a variable 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 Í on a particular matrix , i nput rows, columns, and entries, your screen should be similar to Figure 3 (on the following page). To view the matrix from the home screen, press y 5 to return home, and then choose y and select the matrix. You can create vectors in a similar fashion. Simply enter vectors in as n × 1 column matrices.

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