Texas Instruments TI-89 Developer's Guide

Appendix A: System Routines — EStack Arithmetic
509
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
replace_top2_with_ratio
Declaration:
void
replace_top2_with_ratio
(EStackIndex
i
)
Category(ies):
EStack Arithmetic
Description:
Replaces the top two expressions on the estack with the
internally-simplified (expression
i
)/(top expression).
Inputs:
i
— Index to the top tag of the deeper of the top two expressions of the
estack. These top two expressions are internally-simplified
algebraic expressions, algebraic comparisons, or aggregates
thereof.
Outputs:
None
Assumptions:
None
Side Effects:
None
Availability:
On AMS 2.02 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: divide_top, push_divide, push_reciprocal,
replace_top_with_reciprocal
Example:
void push_log_gen (EStackIndex i, EStackIndex j)
/* Pushes onto the estack the logarithm to the base indexed by j of
expression indexed by i.
*/
{ Access_AMS_Global_Variables;
if (j)
{ push_ln (i);
i = top_estack;
push_ln (j);
replace_top2_with_ratio (i);
}
else
push_log10 (i);
}

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