Share

Share(function)

replace internally equal common subexpressions in function by the same reference to reduce memory consumption and return the number of times where Share(function) could replace a common subexpression.

See

• Wikipedia - Common subexpression elimination

Examples

>> people = <|236234 -> <|"name" -> "bob", "age" -> 18, "sex" -> "M"|>,253456 -> <|"name" -> "sue", "age" -> 25, "sex" -> "F"|>, 323442 -> <|"name" -> "ann", "age" -> 18, "sex" -> "F"|>

<|236234-><|name->bob,age->20,sex->M|>,253456-><|name->sue,age->25,sex->F|>,323442-><|name->ann,age->18,sex->F|>|>

"age" -> 18 and "sex" -> "F" could be replaced once each times by the same reference internally:

>> Share(people)
2

>> people
<|236234-><|name->bob,age->20,sex->M|>,253456-><|name->sue,age->25,sex->F|>,323442-><|name->ann,age->18,sex->F|>|>"

Related terms

Compile, CompilePrint, OptimizeExpression

Implementation status

• 🧪 - experimental

Github

• Implementation of Share