Texas Instruments TI89 Developer Guide - Page 276
Algebra Utilities, did_push_lincf
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UPC - 033317198566
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234 Appendix A: System Routines - Algebra Utilities did_push_lincf Declaration: Boolean did_push_lincf (EStackIndex i, EStackIndex vi) Category(ies): Algebra Utilities Description: Determines if the expression indexed by i is not linear in the variable indexed by vi. Inputs: i - Index of the top tag of an internally-simplified expression. vi - Index of the top tag of a variable. Outputs: Returns FALSE if the expression indexed by i is not linear in the variable indexed by vi. Otherwise pushes the coefficient of vi (perhaps 0), then returns TRUE. Assumptions: None Side Effects: None Availability: All versions of the TI-89 / TI-92 Plus. TI-89 / TI-92 Plus Differences: None See Also: push_poly_deg_in_var_or_kernel, linear_degree, index_if_pushed_binomial_info, index_if_pushed_qquad_info Example: If i indexes (x^2 † y + x + y) † z and vi indexes y, then did_push_lincf(i, vi) pushes (x^2 + y) † z and returns TRUE. Boolean did_push_recip_lincf (EStackIndex i, EStackIndex vi) /* If the expression indexed by i is linear in the variable indexed by vi, pushes the reciprocal of the linear coefficient then returns TRUE. Otherwise returns FALSE. */ { if (did_push_lincf (i, vi)) { replace_top_with_reciprocal (); return TRUE; } return FALSE; } TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001
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