Ng_Approxesi - Texas Instruments TI-89 Developer's Manual

540

NG_approxESI

Declaration: void NG_approxESI (EStackIndex esi )
Category(ies): Expression Evaluation / Algebraic Simplification
Description: Forces the simplification of an expression in APPROX mode.
esi — EStackIndex of the expression to be simplified.
Inputs:
Outputs: Pushes onto the estack the external tokenized result of fully simplifying the
input expression in APPROX mode.
Assumptions: None
Side Effects: May cause estack expansion, heap compression, or throw errors
associated with APPROX simplification of the input expression.
Availability: All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences: None
See Also: NG_rationalESI, NG_execute
Example:
If j indexes the bolded tag in the following external tokenized form of the expression 3/2 + (-9)
3 1 NONNEGATIVE_INTEGER_TAG 2 1 NONNEGATIVE_INTEGER_TAG DIVIDE_TAG 9 1
NONNEGATIVE_INTEGER_TAG CHS_TAG SQRT_TAG ADD_TAG
then
NG_approxESI (j);
pushes the external tokenized form of 1.5 + 3.
the bolded tag.
0x40 0x00 0x15 0x00 0x00 0x00 0x00 0x00 0x00 FLOAT_TAG 0x40 0x00 0x30 0x00 0x00
0x00 0x00 0x00 0x00 FLOAT_TAG I_TAG MULTIPLY_TAG ADD_TAG
TI-89 / TI-92 Plus Developer Guide
Appendix A: System Routines — Expression Evaluation /
onto the estack such that top_estack points to
i
Not for Distribution
Algebraic Simplification
Beta Version January 26, 2001