Lead_Base_Index - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — Algebra Utilities

lead_base_index

Declaration: EStackIndex lead_base_index (EStackIndex i )
Category(ies): Algebra Utilities
Description: Returns factor_base_index (lead_factor_index ( i )).
Inputs: i
Outputs: Returns factor_base_index (lead_factor_index ( i )).
Assumptions: None
Side Effects: None
Availability: On AMS 1.05 and higher.
TI-89 / TI-92 Plus
Differences: None
See Also: factor_base_index, index_of_lead_base_of_lead_term
Example:
Boolean has_unit_base (EStackIndex i)
/* Returns TRUE if at least one of the top_level factors has a physical unit or
physical constant as a base. Otherwise returns FALSE.
*/
{ while (! IS_NUMBER_TAG (ESTACK (i)))
{ if (IS_UNIT (lead_base_index (i)))
return TRUE;
i = remaining_factors_index (i);
}
return FALSE;
}
TI-89 / TI-92 Plus Developer Guide
— Index of the top tag of an internally-simplified algebraic expression.
Not for Distribution
259
Beta Version January 26, 2001