Divide_Top - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — EStack Arithmetic

divide_top

Declaration: void divide_top (EStackIndex i )
Category(ies): EStack Arithmetic
Description: Replaces the top expression on the estack with the internally-simplified
ratio of the top divided by the expression indexed by i .
i
Inputs:
Outputs: None
Assumptions: i and top_estack point to the top tags of algebraic expressions, algebraic
comparisons, or aggregates thereof.
Side Effects: None
Availability: On AMS 2.02 and higher.
TI-89 / TI-92 Plus
Differences: None
See Also: push_ratio, replace_top2_with_ratio, push_reciprocal,
replace_top_with_reciprocal
Example:
void push_coef_list (EStackIndex i, EStackIndex ki)
/* i indexes a polynomial in kernel ki.
Pushes a tail of its coefficients (including zero-coefficients),
with the constant coefficient deepest.
*/
{ Access_AMS_Global_Variables;
EStackIndex j, ans;
push_quantum (END_TAG);
ans = top_estack;
push_expression (i);
i = top_estack;
while (! is_independent_of (i, ki))
{ push_substitute_simplify (i, ki, Integer0Index);
j = top_estack;
push_difference (i, j);
divide_top (ki);
ans = j - deleted_between (ans, i);
i = top_estack;
}
}
TI-89 / TI-92 Plus Developer Guide
— Index to an internally-simplified algebraic expression, algebraic
comparison, or aggregate thereof.
Not for Distribution
469
Beta Version January 26, 2001