# Window Editor Variables in Sequence Mode on TI-83 Plus

The Window editor when the TI-83 Plus graphing calculator is in Sequence mode offers the following list of variables you must set when graphing a sequence:

This setting contains the first value of the independent variable*n*Min:*n*. It must be set equal to 0 or a positive integer.appears both in the Window editor and in the Y= editor. If you change the value of*n*Minin either the Window editor or the Y= editor, the value of*n*Minwill automatically be updated in both editors.*n*MinThis setting contains the largest value of the independent variable*n*Max:*n*that you want the calculator to use to evaluate your sequences. For example, if= 0 and*n*Min= 100, the calculator will evaluate the first 101 terms in each sequence.*n*Maxmust be set equal to a positive integer that is greater than*n*Max. Be reasonable when entering a value for*n*Min. If you’re graphing three sequences and*n*Max= 1,000, it’s going to take the calculator at least a minute to get the job done.*n*MaxIf it’s taking a long time for the calculator to graph your sequences, and you start to regret that rather large value you placed in

, press*n*Max**[ON]**to terminate the graphing process. You can then go back to the Window editor and adjust thesetting.*n*Max**PlotStart:**This setting**PlotStart**= 20, then the calculator starts the graph with the 20th term in each sequence.This isn’t always intuitive. If

= 1, then the 20th term in the sequence u(*n*Min*n*) is u(20). But if= 0, then the 20th term in this sequence is u(19).*n*Min**PlotStart**must be set equal to a positive integer. Usually it’s set equal to 1 so that the graph starts at the beginning of a sequence.**PlotStep:**This setting tells the calculator if you want to skip graphing any terms in each sequence. A setting of 1 tells the calculator to graph every term in each sequence; a setting of 2 tells it to graph every other term; and a setting of 3 tells it to graph every third term, and so on.**PlotStep**must be set equal to a positive integer. Usually it’s set equal to 1 so that the graph shows all terms in your sequences.

You use the remaining items in the Window editor to set a viewing window for the graph.