====== Calculate Value 2 ======

===== Description =====

Evaluates an algebraic or logical expression once and returns a single scalar value, in the same way as [[Calculate Value]], but performing all internal operations using double-precision reals throughout, rather than the precision defined by ImageExpression::Value.

===== Inputs =====

^ Name  ^ Type  ^ Description  ^
| Expression  | [[Image Expression Type]]  | Algebraic or logical expression that evaluates to a single numeric result. Must be enclosed in square brackets ''[ ]'' in EGO Script.  |

===== Optional Inputs =====

^ Name  ^ Type  ^ Description  ^ Default Value  ^
| Default Value  | [[Real Value Type]]  | Value returned if evaluating the expression produces an algebraic error. When not provided, evaluation errors are propagated. This is an advanced port.  | .none  |

===== Outputs =====

^ Name  ^ Type  ^ Description  ^
| Result  | [[Real Value Type]]  | The computed scalar value.  |

===== Group =====

[[Functor List#Table | Table]]

===== Notes =====

Tables, lookup tables, and scalar values referenced in the expression must be connected through hook functors before the expression is written: tables and lookup tables through [[Number Table]] (referenced as ''t1'', ''t2'', … in the verbose form), and scalar values through [[Number Value]] (''v1'', ''v2'', …).

Maps cannot be connected to this functor, since it has no cell context.

See [[Calculate Value]] for further notes on syntax and available expression features, which apply equally to this functor.

===== Internal Name =====

CalculateValue2