Push_But_Term - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — Algebra Utilities

push_but_term

Declaration: void push_but_term (EStackIndex i , EStackIndex j )
Category(ies): Algebra Utilities
Description: Pushes onto the estack the sum of the terms of expression i without the
leading term of j .
If i == j and ESTACK( i ) != ADD_TAG, pushes Float0 if
IS_ARITH_APPROX is true and Integer0 if IS_ARITH_APPROX is false.
Use this function to push all but a selected syntactic term out of an
expression.
If i indexes x + y + 3 and j indexes the partial reductum y + 3, then
push_but_term(i, j)
Functions such as index_reductum_with_tag_base can be used to select
such a term.
i
Inputs:
j
Outputs: None
Assumptions: None
Side Effects: None
Availability: All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences: None
See Also: lead_term_index, reductum_index
Example:
void push_but_term (EStackIndex i, EStackIndex j)
{ if (i == j)
push_expression (reductum_index (i));
else
{ push_but_term (reductum_index (i), j);
add_to_top (lead_term_index (i));
}
}
TI-89 / TI-92 Plus Developer Guide
pushes x + 3.
— Index of the top tag of an internally-simplified algebraic expression.
— i or the index of one of the reductums of the expression indexed
by i .
Not for Distribution
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Beta Version January 26, 2001