You may want to use the TI-92 programs for displaying and manipulating images that were given in the previous module. Click here for those programs.
Vectors are denoted on the TI-92 using square brackets with commas separating the entries as shown on the screen below.
Note: Even though the commas separating the entries of a vector do not appear in the main part of the TI-92 screen you must type them when entering the vector. The screen below shows what happens when the commas are omitted.
For some of the exercises in this module you will want to graph one or more points (represented as vectors) on the TI-92 screen. The following program will enable you to do so. You can enter it into the TI-92 by typing it in or if your workstation has the TI-Graph Link cable and software by downloading it from your computer.
The screen below illustrates the way the program showpts is used
The syntax for showpts is a bit unusual. It requires five arguments. The first argument is a list of the vectors (representing points in the plane) to be displayed. The list is enclosed in curly brackets and the vectors are separated by commas. Each vector is enclosed in quote symbols and can be an expression. Notice that in the screen above three vectors are to be displayed -- a, b, and a + b. The vectors a and b were described first by the lines
[1, 2] -> a [2, 1] -> b
and the third vector a + b will be computed from a and b. The screen below shows the three points.
The last four arguments for showpts give the range of the x- and y-axes.