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SOLUTIONS
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Functions
- Defer
- Delete
- Dynamic
- Evaluate
- Evaluator
- Extract
- Hold
- HoldAll
- HoldAllComplete
- HoldComplete
- HoldFirst
- HoldForm
- HoldPattern
- HoldRest
- MemoryConstrained
- NHoldAll
- NHoldFirst
- NHoldRest
- Position
- Refresh
- ReleaseHold
- ReplaceAll
- ReplacePart
- SequenceHold
- TimeConstrained
- ToExpression
- ToString
- Unevaluated
- Update
- With
- Related Guides
- Tutorials
Evaluation Control
Mathematica normally takes any expression it is given, and evaluates it as far as possible. But built into the Mathematica language is a collection of flexible primitives that allow finer control over the process of evaluation in cases where it is needed.
ReferenceReference
Evaluation Control for Complete Expressions
Hold — hold an expression unevaluated
HoldForm — display an expression in unevaluated form
Defer — display unevaluated, but evaluate if given as Mathematica input
Evaluation Control for Function Arguments
HoldAll, HoldFirst, HoldRest — attributes for specifying held function arguments
Evaluate — immediately evaluate a function argument
Unevaluated — pass a function argument unevaluated
More Detailed Control
ReleaseHold — release hold constructs
HoldComplete ▪ HoldPattern ▪ HoldAllComplete ▪ SequenceHold ▪ Update
NHoldAll, NHoldFirst, NHoldRest — prevent numerical evaluation of arguments
Manipulating Unevaluated Expressions
With — insert variable values without evaluation
Extract — extract numbered parts without evaluation
ReplaceAll(/.) ▪ ReplacePart ▪ Delete ▪ Position
ToString, ToExpression — convert to and from string form
Global Evaluation Control
$IterationLimit ▪ $RecursionLimit ▪ TimeConstrained ▪ MemoryConstrained
