Texas Instruments TI89 Developer Guide - Page 282
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240 Appendix A: System Routines - Algebra Utilities index_if_pushed_qquad_info Declaration: EStackIndex index_if_pushed_qquad_info (EStackIndex i, EStackIndex x, EStackIndex h) Category(ies): Algebra Utilities Description: a † x^(2h) + b † x^h + c is quasi-quadratic in x, with half-degree h. h indexes a number, x indexes a variable, and i indexes a polynomial in that variable - generalized to allow non-negative fractional powers. Determines whether or not the polynomial is a quasi-quadratic of half-degree h in x. If you do not know h, first use push_poly_deg_in_var_or_kernel ( . . . ). For example: If i indexes u^3 † (v^6 + v^3 † w) + u + 1 and x indexes v and h indexes 3, then pushes u + 1, then u^3 † w, then u^3, then returns the index of the pushed u^3 † w. Inputs: i - Index of the top tag of an internally-simplified algebraic expression. x - Index of the top tag of a variable. h - Index of the top tag of a tagged number. Outputs: Returns NULL_INDEX if the polynomial is not quasi-quadratic of half-degree h in x. Otherwise pushes onto the estack the constant, then middle, then lead coefficient; then returns the index of the middle coefficient. 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, did_push_lincf, index_if_pushed_binomial_info (continued) TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001
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