Texas Instruments TI-89 Developer's Guide

Appendix A: System Routines — Algebra Utilities
253
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
is_neg_lead_numr_coef_re_part
Declaration:
Boolean
is_neg_lead_numr_coef_re_part
(EStackIndex
i
)
Category(ies):
Algebra Utilities
Description:
Determines whether the lead numeric coefficient of the real part of the
internally-simplified algebraic expression indexed by
i
is negative. This
function is useful for exploiting symmetry (f(
L
z) -> f(z)) and antisymmetry
(f(
L
z) ->
L
f(z)).
Inputs:
i
— Index of the top tag of an internally-simplified expression.
Outputs:
Returns TRUE if the lead numeric coefficient of the real part of the
internally-simplified algebraic expression indexed by
i
is negative.
Otherwise returns 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: is_negative
(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