Texas Instruments TI-89 Developer's Manual page 285

Appendix A: System Routines — Algebra Utilities
index_numeric_term
Example: If i indexes the internally-simplified expression
x^2 + 7 + 1 + x
then index_numeric_term(i) returns index(8).
If i indexes the internally-simplified expression
x^2 + x
then index_numeric_term(i) returns Float0Index if IS_ARITH_APPROX
is true and Integer0Index if IS_ARITH_APPROX is false.
If i indexes the internally-simplified expression
x^2 + p
then index_numeric_term(i) returns Float0Index if IS_ARITH_APPROX
is true and Integer0Index if IS_ARITH_APPROX is false.
Boolean sum_has_modest_numeric_term (EStackIndex i)
/* i indexes a sum.
Returns TRUE if it does not have a top-level numeric term or if its
magnitude is < MAX_EXP_ARG. Otherwise returns FALSE.
*/
{ i = index_numeric_term (i);
return NULL_INDEX == i ||
FABS (estack_number_to_Float (i)) < MAX_EXP_ARG;
}
TI-89 / TI-92 Plus Developer Guide
(continued)
Not for Distribution
243
Beta Version January 26, 2001