22 Chapter 2: TI-83 Plus Specific Information
TI-83 Plus Developer Guide Third Release May 28, 2002
System Variables that Are Output Only
These are the statistical output variables. They are stored to after executing either the
1-varstat, 2-varstat, or a regression command. The TI-83 Plus system considers these
variables invalid if no statistical command was executed; therefore, values are not
stored to them.
Recall these values using the following system routine.
Rcl_StatVar Recalls a statistical result into OP1, if statistics are valid. The
accumulator contains a token value of the statistical variable to recall.
The token values are contained in the include file, TI83plus.inc.
User RAM
User RAM (see Fig. 2.4) is used to store the data structures of variables that are
dynamically created. These variables are created by both users and the TI-83 Plus
system.
The following sections contain an overall description of TI-83 Plus variable naming
conventions, data structures, creation, and accessing.
Variable Data Structures
Numeric Based Data Types
This class of data types is built of floating-point numbers, and in some cases, a size
field. These data types include Real, Complex, Real List, Complex List, and Matrix.
9 Bytes
0 +1 +2 +3 +4 +5 +6 +7 +8
T EXP DD DD DD DD DD DD DD
Table 2.9: Floating-Point Number Format
T = object type where:
Bit
Description
0 – 4 0 if a real variable’s data,
0Ch if part of a complex variable’s data
5 – 6 Future use
7 Mantissa sign — 0 = positive/1 = negative
EXP = 00h to FFh 80h to FFh = Exponent of (0) to (128)
7Fh to 00h = Exponent of (1) to (127)
DD = two digits of the mantissa, two per byte
First byte of
mantissa
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