Appendix A: System Routines — Expression Evaluation /
542
Algebraic Simplification
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
NG_rationalESI
Declaration:
void
NG_rationalESI
(EStackIndex
esi
)
Category(ies):
Expression Evaluation / Algebraic Simplification
Description:
Forces the simplification of an expression in EXACT mode.
Inputs:
esi
— EStackIndex of the expression to be simplified.
Outputs:
Pushes onto the estack the external tokenized result of fully simplifying the
input expression in EXACT mode.
Assumptions:
None
Side Effects:
May cause estack expansion, heap compression, or throw errors
associated with EXACT 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_approxESI, NG_execute
Example:
If j indexes the bolded tag in the following external tokenized form of the expression 1.5 +
√
(-9)
0x40 0x00 0x15 0x00 0x00 0x00 0x00 0x00 0x00 FLOAT_TAG 9 1
NONNEGATIVE_INTEGER_TAG CHS_TAG SQRT_TAG
ADD_TAG
then
NG_rationalESI (j);
pushes the external tokenized form of 3/2 + 3
i
onto the estack such that
top_estack
points to
the bolded tag.
2 1 3 1 POSITIVE_FRACTION_TAG 3 1 NONNEGATIVE_INTEGER_TAG I_TAG
MULTIPLY_TAG
ADD_TAG
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