Appendix A: System Routines — Algebra Utilities
291
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
push_substitute_using_such_that
Declaration:
void
push_substitute_using_such_that
(EStackIndex
i
, EStackIndex
vi
,
EStackIndex
val
)
Category(ies):
Algebra Utilities
Description:
Substitutes a value for a variable throughout an expression.
Inputs:
i
— EStackIndex of the target expression.
vi
— EStackIndex of a variable.
val
— EStackIndex of the value to substitute.
Outputs:
Returns the fully simplified, internal tokenized form of
i
after substituting
val
for each occurrence of
vi
. Any pre-existing assigned value or substitution
value for
vi
will be ignored during this operation.
Assumptions:
None
Side Effects:
May cause estack expansion, heap compression, or throw errors
associated with the full simplification of the expression.
Availability:
On AMS 2.04 and higher.
TI-89 / TI-92 Plus
Differences:
None
See Also: NG_such_that_index
Example:
If i indexes the bolded tag in the expression x + 1 as follows
1 1 NONNEGATIVE_INTEGER_TAG X_VAR_TAG
ADD_TAG
and j indexes the bolded tag in the variable x as follows
X_VAR_TAG
and k indexes the bolded tag in the value 2 as follows
2 1
NONNEGATIVE_INTEGER_TAG
then
push_substitute_using_such_that (i, j, k);
will substitute 2 for x and then simplify the expression to 3 in the estack such that
top_estack
points to the bolded tag.
3 1
NONNEGATIVE_INTEGER_TAG
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