Texas Instruments TI89 Developer Guide - Page 289
lead_base_index
UPC - 033317198566
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Appendix A: System Routines - Algebra Utilities 247 index_rmng_fctrs_start_base Declaration: EStackIndex index_rmng_fctrs_start_base (EStackIndex i, EStackIndex j) Category(ies): Algebra Utilities Description: This function can be used to determine if the expression indexed by j or any power of that expression is identical to i or any of its syntactic factors. If so, use push_but_factor to form its cofactor. Inputs: i, j - Index of the top tags of internally-simplified algebraic expressions. Outputs: Returns NULL_INDEX if the expression indexed by j is not identical to the one indexed by lead_base_index(i) or lead_base_index (remaining_factors_index(i)) or lead_base_index (remaining_factors_index (remaining_factors_index(i))), etc. Otherwise returns the shallowest index k such that the expression indexed by j is identical to the one indexed by lead_base_index(k = i) or lead_base_index (k = remaining_factors_index(i)) or lead_base_index (k = remaining_factors_index (remaining_factors_index(i)), etc. Assumptions: None Side Effects: None Availability: All versions of the TI-89 / TI-92 Plus. TI-89 / TI-92 Plus Differences: None See Also: index_rmng_fctrs_start_fctr_tag, index_rmng_fctrs_start_base_tag, index_rmng_factor Example: push_quantum (10u); push_quantum (EXP_TAG); /* exp(z) */ push_quantum_as_nonnegative_int (2u); push_quantum (9u); push_quantum (EXP_TAG); push_quantum (EXPONENTIATION_TAG); /* exp(y)^2 */ push_quantum (MULTIPLY_TAG); push_quantum (8u); push_quantum (LN_TAG); /* ln(x) */ push_quantum (MULTIPLY_TAG); i = top_estack; /* ln(x) * exp(y) * exp(z) */ push_quantum (9u); push_quantum (EXP_TAG); j = top_estack; /* exp(y) */ k = index_rmng_fctrs_start_base (i,j); if (NULL_INDEX != k) push_but_factor(i,k); /* pushes ln(x) * exp(z) */ TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001