Module formula 

Equation-editor formulas: parsing and grid-cell evaluation.

The grammar follows the VERDI formula editor: arithmetic (+ - * / ^ **), elementary functions, and per-cell aggregation over time or vertical layers. NAME[n] references variable NAME in the n-th opened dataset (1-based); an unqualified NAME refers to the dataset being viewed.

Structs

VarRef

Enums

Aggregate

AggregateAxis

BinaryOp

Expr

Function

Constants

FUNCTION_NAMES

Names accepted by the parser, listed in the formula editor and docs.

Traits

FormulaInputs

Data access used while evaluating a formula.

Functions

depends_on

Whether the result varies along axis, i.e. some reference is not enclosed by an aggregation over that axis.

evaluate

Evaluate expr at the given time and layer indices into a displayable slice.

evaluate_constant

Evaluate a formula that contains only numbers and functions.

is_identifier

Whether text is a plain identifier usable as a formula name.

is_identifier_char

Characters that may appear in an unquoted variable name after the first.

parse

Parse a formula expression (without a name = prefix).

references

Unique variable references in order of first appearance.