ToExpression

Usage

• ToExpression[input] gives the expression obtained by interpreting strings or boxes as Mathematica input.
• ToExpression[input, form] uses interpretation rules corresponding to the specified form.
• ToExpression[input, form, h] wraps the head h around the expression produced before evaluating it.

Notes

• Example: ToExpression["1 + 1"]

• form can be InputForm, StandardForm, TeXForm, TraditionalForm or MathMLForm.

• ToExpression["string"] uses InputForm interpretation rules.

• ToExpression[boxes] uses StandardForm interpretation rules.

• ToExpression prints a message and returns $Failed if it finds a syntax error. ToExpression does not call $SyntaxHandler.

• The input given in ToExpression can correspond to multiple Mathematica expressions. ToExpression processes each one in turn, just like Get.

• ToExpression[input, form, Hold] can be used to convert input to an expression, but with the expression wrapped in Hold to prevent evaluation.

• ToExpression uses any relevant definitions given for MakeExpression.

• See Section 2.9.4.

• See also: Symbol, MakeExpression, ToString, ToBoxes, SyntaxQ, SyntaxLength, Read, Get.

• New in Version 1; modified in 5.1.

Further Examples