Texas Instruments TI-89 - Replace_Top2_With_Sum

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Appendix A: System Routines — EStack Arithmetic
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
replace_top2_with_sum
Declaration:
void
replace_top2_with_sum
(EStackIndex
i
)
Category(ies):
EStack Arithmetic
Description:
Replaces the top two expressions of the estack with their
internally-simplified sum. If one operand is a scalar and the other is a
square matrix, the scalar is distributed only over the diagonal of the
matrix.
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: push_sum, push_difference, subtract_from_top,
replace_top2_with_difference, push_arg_plus_1, add1_to_top,
subtract1_from_top, add_to_top, push_arg_minus_1
Example:
void push_quadratic_discriminant (EStackIndex a, EStackIndex b, EStackIndex c)
/* Pushes onto the estack b^2 - 4 a c. */
{ Access_AMS_Global_Variables;
EStackIndex old_top = top_estack;
push_negate_quantum_as_negint (4u);
times_top (a);
times_top (c);
a = top_estack;
push_square (b);
replace_top2_with_sum (a);
}