Texas Instruments TI89 Developer Guide - Page 338
remaining_factors_index, IS_ARITH_APPROX is true and Integer1Index if IS_ARITH_APPROX is
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296 Appendix A: System Routines - Algebra Utilities remaining_factors_index Declaration: Category(ies): Description: EStackIndex remaining_factors_index (EStackIndex i) Algebra Utilities If i indexes a MULTIPLY_TAG, returns the index of the deeper of its two operands. Otherwise returns Float1Index if IS_ARITH_APPROX is true and Integer1Index if IS_ARITH_APPROX is false. For example: If i indexes the internally-simplified expression (x^2) then remaining_factors_index(i) returns Float1Index if IS_ARITH_APPROX is true and Integer1Index if IS_ARITH_APPROX is false. Internally-simplified products and ratios have the most main factor shallowest, with less main factors below that. Also, the lead factor of an internally-simplified product is never a product. For example: If i indexes the internally-simplified expression (3 * x^2) * y then remaining_factors_index(i) returns index(3 † y). For the default mode IS_RECURSIVE, similar powers of the main variable are collected. For example: If i indexes the internally-simplified expression x^2 * y + x^2 then remaining_factors_index(i) returns index(y + 1). Internally-simplified numeric denominator factors are combined with numeric numerator factors into a single numeric factor. For example: If i indexes the internally-simplified expression 3/2 then remaining_factors_index(i) returns Float1Index if IS_ARITH_APPROX is true and Integer1Index if IS_ARITH_APPROX is false. Note that Float1Index and Integer1Index are not normally physically within the expression indexed by i. (continued) TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001
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