Texas Instruments TI-89 Developer's Guide

242
Appendix A: System Routines — Algebra Utilities
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
index_numeric_term
Declaration:
EStackIndex
index_numeric_term
(EStackIndex
i
)
Category(ies):
Algebra Utilities
Description:
i
indexes an internally-simplified algebraic expression. Internally-simplified
sums and differences have at most one term with a numeric tag, in which
case it is the deepest term. Returns the index of this term if there is one.
Otherwise, returns Float0Index if IS_ARITH_APPROX is true and
Integer0Index if IS_ARITH_APPROX is false.
Note that Float0Index and Integer0Index are not ordinarily physically
within the expression indexed by
i
.
Inputs:
i
— Index of the top tag of an internally-simplified algebraic expression.
Outputs:
Returns the index of the numeric term if there is one. Otherwise, returns
Float0Index if IS_ARITH_APPROX is true and Integer0Index if
IS_ARITH_APPROX is false.
Assumptions:
None
Side Effects:
None
Availability:
All versions of the TI
-
89 / TI
-
92 Plus.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: push_constant_terms
(continued)

Texas Instruments TI-89 Specifications

General

Display size (HxV)	100 x 160 mm
Memory type	639K FLASH ROM, 188K bytes RAM
Compatible operating systems	Operating System 2.09
Battery type	AAA