Texas Instruments -84 Plus, Manual Book

Page: 158 / 696

Chapter 6: Sequence Graphing 155
• The previous term or the term that precedes the previous term in another sequence
function, such as
u( n
N
1)
or
u( n
N
2)
referenced in the sequence
v( n )
.
Note:
Statements in this chapter about
u( n )
are also true for
v( n )
and
w( n )
; statements
about
u( n
N
1)
are also true for
v( n
N
1)
and
w( n
N
1)
; statements about
u( n
N
2)
are also true for
v( n
N
2)
and
w( n
N
2)
.
Displaying the Sequence Y= Editor Displaying the Sequence Y= Editor Displaying the Sequence Y= Editor Displaying the Sequence Y= Editor
After selecting Seq mode, press
o
to display the sequence Y= editor.
In this editor, you can display and enter sequences for
u( n )
,
v( n )
, and
w( n )
. Also, you can
edit the value for
n Min
, which is the sequence window variable that defines the minimum
n
value to evaluate.
The sequence Y= editor displays the
n Min
value because of its relevance to
u( n Min)
,
v( n Min)
, and
w( n Min)
, which are the initial values for the sequence equations
u( n )
,
v( n )
,
and
w( n )
, respectively.
n Min
in the Y= editor is the same as
n Min
in the window editor. If you enter a new value
for
n Min
in one editor, the new value for
n Min
is updated in both editors.
Note:
Use
u( n Min)
,
v( n Min)
, or
w( n Min)
only with a recursive sequence, which requires an
initial value.