Operation Manual

Chapter 6: Sequence Graphing 108
In this editor, you can display and enter sequences for u(n), v(n), and w(n). Also, you can edit the value
for
nMin, which is the sequence window variable that defines the minimum n value to evaluate.
The sequence Y= editor displays the
nMin value because of its relevance to u(nMin), v(nMin), and
w(nMin), which are the initial values for the sequence equations u(n), v(n), and w(n), respectively.
nMin in the Y= editor is the same as nMin in the window editor. If you enter a new value for nMin in
one editor, the new value for
nMin is updated in both editors.
Note: Use u(nMin), v(nMin), or w(nMin) only with a recursive sequence, which requires an initial value.
Selecting Graph Styles
The icons to the left of u(n), v(n), and w(n) represent the graph style of each sequence (Chapter 3). The
default in Seq mode is (Dot-Thick), which shows discrete values.
Selecting and Deselecting Sequence Functions
The TI-84 Plus C graphs only the selected sequence functions. In the Y= editor, a sequence function is
selected when the = signs of both u(n)= and u(nMin)= are highlighted.
To change the selection status of a sequence function, move the cursor onto the
= sign of the function
name, and then press Í. The status is changed for both the sequence function u(n) and its initial
value
u(nMin).
Defining and Editing a Sequence Function
To define or edit a sequence function, follow the steps in Chapter 3 for defining a function. The
independent variable in a sequence is
n.
In Seq graphing mode, you can enter the sequence variable by pressing „.
Icon Style Description
ç Thin A solid line connects plotted points; this is the default in
Connected mode
è Thick A thick solid line connects plotted points
é Above Shading covers the area above the graph
ê Below Shading covers the area below the graph
ë Path A circular cursor traces the leading edge of the graph and
draws a path
ì Animate A circular cursor traces the leading edge of the graph without
drawing a path
Dot-Thick A dot (3 x 3 pixel) enhances the view around the actual
plotted point; this is the default in Dot mode.
í Dot-Thin A small dot (1 x1 pixel) represents each plotted point.