Texas Instruments TI-89 Developer's Guide

770
Appendix A: System Routines — Math
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
push_comdenom
Declaration:
void
push_comdenom
(EStackIndex
i
, EStackIndex
vi
)
Category(ies):
Math
Description:
Pushes an expression equivalent to the one indexed by
i
, with terms
combined over a common denominator. If
vi
is NULL_INDEX, the
numerator and denominator are fully expanded through all variables, using
distributed form. Otherwise the numerator and denominator are fully
expanded with distributed form through vi. Expansion is not forced with
respect to any variable or kernel if
vi
is more main than any variable or
kernel in
i
.
Inputs:
i
— Indexes an internally-simplified algebraic expression, algebraic
comparison, or aggregate thereof.
vi
— NULL_INDEX or indexes an internally-simplified variable or kernel.
Outputs:
None
Assumptions:
None
Side Effects:
None
Availability:
On AMS 2.02 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: push_standardize, push_factor, push_expand, push_make_proper
Example:
void push_trig_expand (EStackIndex i)
/* i indexes an expression. Temporarily sets global trigonometric mode to
SET_EXPAND_TRIG then pushes a corresponding simplified version of the
expression onto the estack.
*/
{ Access_AMS_Global_Variables;
EStackIndex old_top = top_estack;
CONTROL_BITS old_NG_control = NG_control;
SET_EXPAND_TRIG;
push_internal_simplify (i);
i = top_estack;
push_comdenom (i, NULL_INDEX);
NG_control = old_NG_control;
delete_between (old_top, 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