Accuracy Information - Texas Instruments TI-89 Titanium User Manual

Accuracy Information

Computational
Accuracy
Graphing Accuracy
Note: For a table that lists
the number of pixels in a full
screen or split screen, refer
to "Setting and Exiting the
Split Screen Mode" in Split
Screens.
Appendix B: Technical Reference
To maximize accuracy, the TI-89 Titanium / Voyage™ 200
carries more digits internally than it displays.
Floating-point (decimal) values in memory are stored using up to 14 digits
with a 3-digit exponent.
¦
For min and max Window variables (xmin, xmax, ymin, ymax, etc.), you
can store values using up to 12 digits. Other Window variables use 14
digits.
¦
When a floating-point value is displayed, the displayed value is rounded
as specified by the applicable mode settings (Display Digits, Exponential
Format, etc.), with a maximum of 12 digits and a 3-digit exponent.
¦
RegEQ displays up to 14-digit coefficients.
Integer values in memory are stored using up to 614 digits.
The Window variable xmin is the center of the leftmost pixel used, and
xmax is the center of the rightmost pixel used. @x is the distance between
the centers of two horizontally adjacent pixels.
¦
@x is calculated as (xmax ì xmin) / (# of x pixels ì 1).
¦
If @ x is entered from the Home screen or a program, xmax is calculated
as xmin + @x ù (# of x pixels ì 1).
The Window variable ymin is the center of the bottom pixel used, and ymax
is the center of the top pixel used. @y is the distance between the centers of
two vertically adjacent pixels.
¦
@y is calculated as (ymax ì ymin) / (# of y pixels ì 1).
¦
If is entered from the Home screen or a program, ymax is calculated
@ y
as ymin + @y ù (# of y pixels ì 1).
Cursor coordinates are displayed as eight characters (which may include a
negative sign, decimal point, and exponent). The coordinate values (xc, yc,
zc, etc.) are updated with a maximum of 12-digit accuracy.
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