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To graph data on the TI-86:
The TI-86 has a built-in command to graph data and autoscale the data window.
Press
2nd
+
PLOTS screen. (Your screen may not look exactly like
this one.)
Note: When drawing a graph from the y(x)= list, you
may get an error message or see a scatter plot of ÒoldÓ
data as well as the function graph. If so, turn off the
STAT PLOTS with
On the STAT PLOTS screen, press
play the Plot1 screen, press
press
F1
list L
. Press
1
Press
and press the menu key corresponding to the
mark. You can choose any of the three marks at the
bottom of the screen.
Press
until you return to the home screen. Go to
EXIT
the graph menu and clear the y(x)= list . To have the
TI-86 set an autoscaled view of the data and draw the
scatter plot, press
(ZDATA does not reset the x and y-axis tick marks.
You should do this manually with
if you want different spacing between the marks.)
Press
GRAPH
ÒPlot1" at the top of the screen is now dark. This is
because you have turned Plot1 ÒonÓ. If you always put
input data in list L
turn the scatter plot off and on from the y(x)= screen
rather than the stat plots screen from this point on.
To turn Plot1 off, use
position, and press
Plot1 back on.
¥ TI-86 lists can be named and stored in the calculatorÕs memory for later recall and use. I f
you do this and use the list by its stored name, you must use the name of the list in the stat
plot setup or on the stat plot screen each time you change lists. Refer to your TI-86
Guidebook for details.
1.4.6 FINDING FIRST DIFFERENCES
program DIFF to compute first differences in the output values. If the data are perfectly
linear (i.e., every data point falls on the graph of the line), the first differences in t h e
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(
)
(
) to display the STAT
STAT
F3
PLOT
(
)
F5
PlOff
ENTER
F1
to turn Plot1 "On",
ENTER
(
)
. Press the menu key under
SCAT
and the menu key under list L
(
)
GRAPH
F3
ZOOM
RANGE
and access the function list. Notice that
and output data in list L
1
to move the cursor to the Plot1
. Reverse the process to turn
ENTER
.
(
) to dis-
PLOT1
.
2
You can enter the names of any
lists. However, it is easiest to
always work with L1 and L2.
(
) .
MORE
F5
ZDATA
or
WIND
, you can
2
A scatter plot is turned on when
its name on the y(x)= screen is
darkened. Remember that you
will have lower-case functions.
When the input values are evenly spaced, use
Chapter 1
You can trace the scatter
plot with the
key.
TRACE
B-23
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