Push_Negate - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — EStack Arithmetic

push_negate

Declaration: void push_negate (EStackIndex i )
Category(ies): EStack Arithmetic
Description: Pushes onto the estack the internally-simplified negative of the expression
indexed by i .
i
Inputs:
Outputs: None
Assumptions: None
Side Effects: None
Availability: On AMS 2.02 and higher.
TI-89 / TI-92 Plus
Differences: None
See Also: negate_top
Example:
Boolean is_symmetric (EStackIndex i, EStackIndex var)
/* Returns TRUE if it can determine that the expression indexed by i is symmetric
with respect to the variable indexed by var. Otherwise returns FALSE.
*/
{ Access_AMS_Global_Variables;
EStackIndex old_top = top_estack;
push_negate (var);
push_substitute_simplify (i, var, top_estack);
subtract_from_top (i);
if (is0 (top_estack))
{ top_estack = old_top;
return TRUE;
}
top_estack = old_top;
return FALSE;
}
TI-89 / TI-92 Plus Developer Guide
— Index of the top tag of an internally-simplified algebraic expression,
algebraic comparison, or aggregate thereof.
Not for Distribution
493
Beta Version January 26, 2001