Push_Zeros - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — Solver

push_zeros

Declaration: void push_zeros (EStackIndex i , EStackIndex vi )
Category(ies): Solver
Description: If invoked via push_internal_simplify, vi and i are simplified to deepest
variable(s).
If vi is not a list, pushes onto the estack a list of zero or more real values
that make i or all of the expressions in list i zero when substituted for the
variable in vi .
Otherwise pushes an empty list if the function could not find simultaneous
real values of the variables in vi that make the expressions in i
simultaneously zero.
Otherwise pushes a matrix of real values with each column representing
the corresponding element variable of vi , and each row representing an
alternate list of corresponding real values that make i or all of the
expressions in list i zero.
All fractional powers are interpreted using the real branch.
Issues XR_USE_SOLVE_WARN when there are additional zeros that
cannot be expressed in this form.
i
Inputs:
vi
Outputs: None
Assumptions: None
Side Effects: None
Availability: On AMS 2.02 and higher.
TI-89 / TI-92 Plus
Differences: None
See Also: push_czeros, push_solve, push_csolve, push_nSolve
Example:
push_quantum_as_nonnegative_int (2u);
exponent = top_estack;
push_quantum (8u);
replace_top2_with_pow (exponent);
subtract1_from_top ()
push_quantum (8u);
push_zeros(i, top_estack);
TI-89 / TI-92 Plus Developer Guide
— Indexes the top tag of an algebraic expression or a list thereof.
— Indexes a variable, an equation of the form variable = constant
representing an initial guess, or a list of variables and/or such
initial guesses.
/* Push variable x */
/* top_estack -> x^2 */
i = top_estack;
/* Push variable x */
/* Pushes {-1, 1} */
Not for Distribution
/* x^2 - 1 */
947
Beta Version January 26, 2001