Deleted_Expression - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — EStack Utilities

deleted_expression

Declaration: EStackDisplacement deleted_expression (EStackIndex i )
Category(ies): EStack Utilities
Description: Deletes the estack expression indexed by i . Global top_estack is reduced
by the number of deleted quantums. Returns the number of deleted
quantums.
Inputs: i
Outputs: Number of deleted quantums.
Assumptions: None
Side Effects: top_estack is reduced by the number of deleted quantums.
Availability: On AMS 1.05 and higher.
TI-89 / TI-92 Plus
Differences: None
See Also: deleted_between, delete_between, delete_expression,
move_between_to_top, moved_between_to_top
Example:
EStackIndex push_cofactors (EStackIndex i, EStackIndex j)
/* i and j index internally-simplified algebraic expressions.
Let gcd denote their greatest common divisor.
Pushes onto the estack (expression j)/gcd then (expression i)/gcd,
then returns the index of the deeper pushed cofactor.
*/
{ i = push_gcd_then_cofactors (i, j, &j);
return j – deleted_expression (i);
}
TI-89 / TI-92 Plus Developer Guide
— Index of the top (highest address) tag of an estack expression.
Not for Distribution
521
Beta Version January 26, 2001