Texas Instruments Titanium TI-89, User Manual

Page: 348 / 977

Sequence Graphing 345
Window Variables
The Window Editor maintains an independent set of Window variables for each Graph
mode setting (just as the Y= Editor maintains independent function lists). Sequence
graphs use the following Window variables.
Note:
Both
nmin
and
nmax
must be positive integers, although
nmin
can be zero;
nmin
,
nmax
,
plotstrt
and
plotstep
must be integers
‚
1. If you do not enter integers, they will be
rounded to integers.
Variable Description
nmin, nmax Smallest and largest n values to evaluate. Sequences are
evaluated at:
u(nmin)
u(nmin+1)
u(nmin+2)
... not to exceed ...
u(nmax)
plotStrt The term number that will be the first one plotted
(depending on plotstep). For example, to begin plotting
with the 2nd term in the sequence, set
plotstrt = 2 . The
first term will be evaluated at nmin but not plotted.
plotStep Incremental n value for graphing only . This does not affect
how the sequence is evaluated, only which points are
plotted. For example, suppose
plotstep = 2 . The
sequence is evaluated at each consecutive integer but is
plotted at only every other integer.
xmin, xmax,
ymin, ymax Boundaries of the viewing window.
xscl, yscl Distance between tick marks on the x and y axes.