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"HeldMathExpression" (Interpreter Type)

Mathematical expression in natural language.

Details

Allowed Forms

  • Any free-form mathematical expression.

Restriction Specifications

Interpretation

Examples

Basic Examples  (6)

Interpret mathematical expressions and avoid evaluation:

Wolfram Language code: Interpreter["HeldMathExpression"]["int sin(y)-iy"]
Wolfram Language code: Interpreter["HeldMathExpression"]["1.4x+3"]
Wolfram Language code: Interpreter["HeldMathExpression"]["a = b+3"]

Find out Wolfram Language representations of natural language queries:

Wolfram Language code: Interpreter["HeldMathExpression"]["second derivative of log x"]

No evaluation is attempted when matching the choices:

Wolfram Language code: Interpreter[Restricted["HeldMathExpression", {{1, 2, 3, 4}}]]["two plus one"]
Wolfram Language code: Interpreter[Restricted["HeldMathExpression", {{2, HoldComplete[2 + 1]}}]]["two plus one"]

By default, new symbols are created in $Context, but a custom context can be specified:

Wolfram Language code: Interpreter[Restricted["HeldMathExpression", All, Automatic, Automatic]]["y + 2"] Context[y]
Wolfram Language code: Interpreter[Restricted["HeldMathExpression", All, Automatic, "mycontext`"]]["k + 2"] Context[k]

Specify contexts for the allowed and output symbols:

Wolfram Language code: mycontext`b = 10; Interpreter[Restricted["HeldMathExpression", Automatic, {"mycontext`", "System`"}, "mycontext`"]]["a+b"] Context[a]

Prevent the creation of any new symbol:

Wolfram Language code: Interpreter[Restricted["HeldMathExpression", Automatic, Automatic, None]]["3+1"]
Wolfram Language code: Interpreter[Restricted["HeldMathExpression", Automatic, Automatic, None]]["z+1"]