Did_Push_Lincf - Texas Instruments TI-89 Developer's Manual

234

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 .
i
Inputs:
vi — Index of the top tag of a variable.
Returns FALSE if the expression indexed by i is not linear in the variable
Outputs:
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
Appendix A: System Routines — Algebra Utilities
— Index of the top tag of an internally-simplified expression.
Not for Distribution Beta Version January 26, 2001