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Chapter 2: Operating the Calculator 31
02OPER DOC TI
-
89/TI
-
92 Plus: O
p
erating the TI
-
89/TI
-
92 Plus (English) SusanGullord Revised:02/23/01 1:06 PM Printed: 02/23/01 2:11 PM Page 31 of 44
By default,
Display Digits = FLOAT 6
, which means that results are
rounded to a maximum of six digits. You can use
3
to select
different settings. The settings apply to all exponential formats.
Internally, the
TI
-
89 / TI
-
92 Plus
calculates and retains all decimal
results with up to 14 significant digits (although a maximum of 12 are
displayed).
Setting Example Description
FIX
(0 – 12)
123. (FIX 0)
123.5 (FIX 1)
123.46 (FIX 2)
123.457 (FIX 3)
Results are rounded to the
selected number of decimal
places.
FLOAT 123.456789012
Number of decimal places varies,
depending on the result.
FLOAT
(1 – 12)
1.
E
2 (FLOAT 1)
1.2
E
2 (FLOAT 2)
123. (FLOAT 3)
123.5 (FLOAT 4)
123.46 (FLOAT 5)
123.457 (FLOAT 6)
Results are rounded to the total
number of selected digits.
By default,
Exponential Format = NORMAL
.
You can use
3
to select from three
settings.
Setting Example Description
NORMAL 12345.6
If a result cannot be displayed in the
number of digits specified by the
Display Digits
mode, the
TI
-
89 / TI
-
92 Plus
switches from
NORMAL
to
SCIENTIFIC
for that
result only.
SCIENTIFIC 1.23456
E
4 1.23456
×
10
4
Exponent (power of 10).
Always 1 digit to the left of the
decimal point.
ENGINEERING 12.3456
E
3 12.3456
×
10
3
Exponent is a multiple of 3.
May have 1, 2, or 3 digits to the
left of the decimal point.
Display Digits Mode
Note: Regardless of the
Display Digits setting, the
full value is used for internal
floating-point calculations to
ensure maximum accuracy.
Note: A result is
automatically shown in
scientific notation if its
magnitude cannot be
displayed in the selected
number of digits.
Exponential Format
Mode
Note: In the history area, a
number in an entry is
displayed in
SCIENTIFIC
if
its absolute value is less
than .001.