Getting Started with TI InterActive! 13
TII_GettingStarted.doc Getting Started with TI InterActive! Karen Davis Revised: 8/22/03 12:20 PM Printed: 8/25/03 8:04 AM Page 13 of 64
Note the three options available under Computation Mode:
Automatic
Uses
Exact
where possible, but uses
Approximate
when your entry contains a
decimal point. Also, certain functions may
display
Approximate
results even if your entry
does not contain a decimal point.
Exact
Any result that is not a whole number is
displayed in a fractional or symbolic form (
1
à
2
,
p
,
2
, etc.). This mode reduces rounding errors
that could be introduced by intermediate
results in chained calculations.
Approximate
All numeric results, where possible, are
displayed in decimal form.
3. Click the
Approximate
option to select it, and click OK. The
result in the Math Box becomes a decimal approximation.
4. Click the Mode Settings button
again, and change the
Computation Mode back to
Automatic
, the original setting,
and click OK.
This chart compares the Computation Mode settings.
Entry
Automatic
Result
Exact
Result
Approximate
Result
8
à
4 2
2
2.
8
à
6
4
3
4
3
1.33333
8.5
ù
3
25.5
51
2
25.5
sqrt(2)
à
2
2
2
2
2
.707107
p
ù
2
2
⋅
p
2
⋅
p
6.28319
p
ù
2. 6.28319
2
⋅
p
6.28319
TIP
: In Automatic mode,
you can force a decimal
result by using a
decimal in the entry.
The decimal point
in the entry forces
the Automatic
result to a decimal.
