Appendix A: System Routines — EStack Arithmetic
489
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
push_difference
Declaration:
void
push_difference
(EStackIndex
i
, EStackIndex
j
)
Category(ies):
EStack Arithmetic
Description:
Pushes onto the estack the internally-simplified difference of the
expression indexed by
i
minus the expression indexed by
j
. 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, j
— Index of top tags of 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, replace_top2_with_sum, add_to_top, subtract_from_top,
replace_top2_with_difference, add1_to_top, subtract1_from_top,
push_arg_plus_1, push_arg_minus_1
Example:
void push_coef_list (EStackIndex i, EStackIndex ki)
/* i indexes a polynomial in the variable or kernel indexed by ki.
Pushes a tail of its coefficients (including zero-coefficients),
with the constant coefficient deepest.
*/
{ Access_AMS_Global_Variables;
EStackIndex j, ans;
push_quantum (END_TAG);
ans = top_estack;
push_expression (i);
i = top_estack;
while (! is_independent_of (i, ki))
{ push_substitute_simplify (i, ki, Integer0Index);
j = top_estack;
push_difference (i, j);
divide_top (ki);
ans = j - deleted_between (ans, i);
i = top_estack;
}
}
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