Texas Instruments TI-89 Developer's Guide

244
Appendix A: System Routines — Algebra Utilities
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
index_of_lead_base_of_lead_term
Declaration:
EStackIndex
index_of_lead_base_of_lead_term
(EStackIndex
i
)
Category(ies):
Algebra Utilities
Description:
Returns the index of the lead base of the lead term of any algebraic
expression indexed by
i
.
Inputs:
i
— Index of the top tag of an algebraic expression.
Outputs:
Returns the index of the lead base of the lead term of any algebraic
expression indexed by
i
.
Assumptions:
None
Side Effects:
None
Availability:
On AMS 1.05 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: factor_base_index, lead_base_index, lead_term_index
Example:
push_quantum_as_nonnegative_int (2u);
exponent = top_estack;
push_quantum (8u); /* Push variable x */
replace_top2_with_pow (exponent);
xsq = top_estack; /* top_estack -> x^2 */
push_quantum (9u); /* Push variable y */
replace_top2_with_prod (xsq); /* top_estack -> x^2 * y */
index_of_lead_base_of_lead_term (top_estack);
/* : Returns index of variable x */
add1_to_top (top_estack); /* top_estack -> x^2 * y + 1 */
index_of_lead_base_of_lead_term (top_estack);
/* : Returns index of variable x */

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