Texas Instruments TI-89 Developer's Guide

Appendix A: System Routines — EStack Arithmetic
463
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
can_be_approxed
Declaration:
Boolean
can_be_approxed
(EStackIndex
i
, Boolean
allow_complex
)
Category(ies):
EStack Arithmetic
Description:
Determines if an expression can be approxed.
Inputs:
i
— Index of the top tag of an expression.
allow_complex
— TRUE if and only if nonreal numbers are allowed in
expression
i
.
Outputs:
Returns TRUE if
allow_complex
is FALSE and the expression indexed by
i
can be approximated to a (perhaps transfinite) number or a list thereof or if
allow_complex
is TRUE, and the expression indexed by
i
can be
approximated to a (perhaps transfinite) complex number or a list thereof.
Otherwise returns FALSE.
Assumptions:
i
points to an expression in the estack or some other locked block.
Side Effects:
None
Availability:
On OS 1.05 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: is_constant
(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