Push_Denominator - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — Algebra Utilities

push_denominator

Declaration: void push_denominator (EStackIndex i )
Category(ies): Algebra Utilities
Description: Pushes the denominator of the expression indexed by i onto the estack.
The denominator of a float or integer is 1.
DIVIDE_TAG does not occur in internally-simplified expressions.
Therefore, the denominator of a power is the reciprocal of the power if the
degree is negative; otherwise the denominator is 1. The denominator of a
product is the passive product of the reciprocals of the factors that have
negative degrees. Otherwise the denominator is 1.
Note that:
The denominator of 1.5 is 1.
The denominator of x^-2 is x^-2.
The denominator of x † (y + 1)^-1 † y^-1 † 3 is (y + 1) † y.
The denominator of x^-1 + 3 is 1.
i
Inputs:
Outputs: None
Assumptions: None
None
Side Effects:
Availability: All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences: None
See Also: push_numerator, push_standardize, push_comdenom
Example:
void push_denominator_of_com_denom (EStackIndex i)
/* Pushes the denominator of the expression that would be obtained by
putting the expression indexed by i over a common denominator.
*/
{ Access_AMS_Global_Variables;
EStackIndex old_top = top_estack;
push_standardize (i);
i = top_estack;
push_denominator (i);
delete_between (old_top, i);
}
TI-89 / TI-92 Plus Developer Guide
— Indexes the top tag of an internally-simplified algebraic expression.
Not for Distribution
273
Beta Version January 26, 2001