Texas Instruments TI-89 Developer's Guide

Appendix A: System Routines — Algebra Utilities
251
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
is_independent_of
Declaration:
Boolean
is_independent_of
(EStackIndex
i
, EStackIndex
j
)
Category(ies):
Algebra Utilities
Description:
Determines whether the expression indexed by
i
is syntactically
independent of the expression indexed by
j
.
Inputs:
i
,
j
— Indices of the top tags of internally-simplified expressions.
Outputs:
Returns TRUE if the expression indexed by
i
is syntactically independent of
the expression indexed by
j
. Otherwise returns FALSE.
Assumptions:
None
Side Effects:
None
Availability:
All versions of the TI
-
89 / TI
-
92 Plus.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: is_free_of_tag, is_independent_of_tail, is_tail_independent_of
Example:
Boolean is_tail_independent_of (EStackIndex i, EStackIndex j)
{ for (;;)
{ if (END_TAG == ESTACK (i))
return TRUE;
else if (is_independent_of (i, j))
i = next_expression_index (i);
else
return FALSE;
}
}

Texas Instruments TI-89 Specifications

General

Display size (HxV)	100 x 160 mm
Memory type	639K FLASH ROM, 188K bytes RAM
Compatible operating systems	Operating System 2.09
Battery type	AAA