Texas Instruments TI89 Developer Guide - Page 778
lead_conjunct_factor_index, remaining_disjuncts_index
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736 Appendix A: System Routines - Logic lead_conjunct_factor_index Declaration: EStackIndex lead_conjunct_factor_index (EStackIndex i) Category(ies): Logic Description: Determines the lead conjunction factor of the expression indexed by i. Internally-simplified conjuncts have the most main Boolean factor shallowest, with less main factors deeper. Also, the lead Boolean factor of an internally-simplified conjunct is never a conjunct. Inputs: i - Index of the top tag of a Boolean expression. Outputs: If i indexes an AND_TAG, returns the index of the operand just below it. Otherwise returns i. Assumptions: None Side Effects: None Availability: On AMS 2.02 and higher. TI-89 / TI-92 Plus Differences: None See Also: remaining_conjuncts_index, lead_disjunct_term_index, remaining_disjuncts_index Example: lead_conjunct_factor_index ("internalSimplified" ((b and a) and c)) Returns index (a). lead_conjunct_factor_index ("internalSimplified"(x > 3)) Returns index (x > 3), void push_but_conjunct_factor (EStackIndex i, EStackIndex j) /* i indexes a (perhaps degenerate) conjunct and j == i or j indexes one of its remaining factors. Pushes onto the estack the conjunct without the lead factor of j. */ { if (i == j) push_expression (remaining_conjuncts_index (i)); else { push_but_conjunct_factor (remaining_conjuncts_index (i), j); and_onto_top (lead_conjunct_factor_index (i)); } } TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001
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