Texas Instruments TI89 Developer Guide - Page 550
times_top, push_product, push_negate, negate_top
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508 Appendix A: System Routines - EStack Arithmetic replace_top2_with_prod Declaration: void replace_top2_with_prod (EStackIndex i) Category(ies): EStack Arithmetic Description: Replaces the top two expressions of the estack with their internally-simplified product. If both operands are conforming matrices, it is the matrix product rather than an element-wise product. Inputs: i - Index to the top tag of the deeper of the top two expressions of the estack. These top two expressions are internally-simplified algebraic expressions, algebraic comparisons, or aggregates thereof. Outputs: None Assumptions: None Side Effects: None Availability: On AMS 2.02 and higher. TI-89 / TI-92 Plus Differences: None See Also: times_top, push_product, push_negate, negate_top Example: Boolean is_odd_expression (EStackIndex i) /* Returns TRUE if the expression indexed by i is recognized as odd. */ { Access_AMS_Global_Variables; EStackIndex old_top; Boolean b; if (SIGN_TAG == ESTACK (i)) return IS_DOMAIN_REAL && is_real (i - 1u); old_top = top_estack; push_arg_minus_1 (i); i = top_estack; push_reciprocal_of_quantum (2u); replace_top2_with_prod (i); b = integer_non_unknown (top_estack) > 0; top_estack = old_top; return b; } TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001
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