Texas Instruments TI89 Developer Guide - Page 529
push_arg_minus_1, subtract_from_top, replace_top2_with_difference, add1_to_top
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Appendix A: System Routines - EStack Arithmetic 487 push_arg_minus_1 Declaration: void push_arg_minus_1 (EStackIndex i) Category(ies): EStack Arithmetic Description: Pushes onto the estack the internally-simplified difference of the expression i minus 1.0 if IS_ARITH_APPROX, or the expression i minus 1 otherwise. If i indexes a square matrix, the one is subtracted only from the diagonal of the matrix. Inputs: i - Index to an internally-simplified algebraic expression, algebraic comparison, or aggregate thereof. Outputs: None Assumptions: i indexes the top tag of an internally-simplified algebraic expression, algebraic comparison, or aggregate thereof. Side Effects: None Availability: On AMS 2.02 and higher. TI-89 / TI-92 Plus Differences: None See Also: push_sum, replace_top2_with_sum, push_difference, subtract_from_top, replace_top2_with_difference, add1_to_top, subtract1_from_top, push_arg_plus_1, add_to_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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