Texas Instruments TI-82 Manual page 19

Notice that the function is defined only when the input
is between 85 and 93. You could find P(85) and P(93) to
help you set the vertical view. However, we choose to
use program AUTOSCL. (See Section 1.1.4 of this Guide.)
When prompted, enter Xmin = 85 and Xmax = 93. The
graph to the right is drawn by the program.
If you wish to see the ÒbreakÓ in the function where the
two pieces join, the width of the screen must be a multiple
of 9.4 and include 90.
Since 90 Ð 0.5(9.4) = 85.3 and 90 + 0.5(9.4) = 94.7, change
Xmin and Xmax to these values and press
Because the two pieces are close together at x = 90, you
may need to take a closer look to see the break. However,
because the calculator draws graphs by connecting function
outputs wherever the function is defined, it will connect the
two pieces unless you tell it not to do so by pressing
and to choose Dot , and press
Now, take a closer look with
( ). To keep the point where the functions break
Zoom In
in view, use
in the middle of the screen down to where the two func-
tions join before pressing
You can find function values by evaluating outputs on the
home screen or using the table.
Do not forget to change the calculatorÕs
to Connected when you finish graphing the piecewise
function.
TI-83 The same procedure as given in the above steps
for the TI-82 will also work for the TI-83. However,
the TI-83 has some additional features that will make
graphing of piecewise functions less complicated.
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ENTER
and
GRAPH
to move the small cursor that appears
to actually zoom in.
ENTER
MODE
.
GRAPH
, use
MODE
.
ZOOM 2
setting back
(See Section 6.1.2 of this
Guide for an example
showing how to fit a
piecewise model to data.)
A-19
Chapter 1