Expressions, units, and tolerances

Symbolic parameters, physical dimensions, conversions, tolerance graphs, and reports.

This catalog contains 59 public symbols. Select a symbol for its exact signature, parameters, return contract, errors, members, aliases, and behavior notes.

Modules

Symbol	Import	Summary
expressions	from cadflow import expressions	Expression graph domain facade.
tolerances	from cadflow import tolerances	Tolerance analysis domain facade.

Classes

Symbol	Import	Summary
Const	from cadflow import Const	Immutable constant node used in the v2 expression graph.
Dimension	from cadflow import Dimension	Physical dimension represented by integer length and angle exponents.
DimensionTolerance	from cadflow import DimensionTolerance	Permitted lower and upper deviations from a nominal dimension.
Expr	from cadflow import Expr	Derived scalar expression node built from one or more operands.
ExpressionGraph	from cadflow import ExpressionGraph	A lightweight registry of expression DAG nodes.
ToleranceAnalysis	from cadflow import ToleranceAnalysis	Nominal value and propagated limits for an expression.
ToleranceCheck	from cadflow import ToleranceCheck	Validation result for one tolerance requirement.
ToleranceContribution	from cadflow import ToleranceContribution	One source dimension's propagated contribution to a result.
ToleranceGraph	from cadflow import ToleranceGraph	Tolerance requirements attached to one expression graph.
ToleranceReport	from cadflow import ToleranceReport	Validation report for every requirement in a tolerance graph.
ToleranceRequirement	from cadflow import ToleranceRequirement	Permitted result deviations for one derived dimension.
Unit	from cadflow import Unit	Named unit with a scale to CadFlow's canonical numeric units.
Var	from cadflow import Var	Named scalar parameter with optional physical-unit and tolerance intent.

Exceptions

Symbol	Import	Summary
ToleranceAnalysisError	from cadflow import ToleranceAnalysisError	Raised when a tolerance chain cannot be propagated safely.
ToleranceValidationError	from cadflow import ToleranceValidationError	Raised when one or more declared tolerance requirements fail.
UnitValidationError	from cadflow import UnitValidationError	Raised when units or expression dimensions are physically inconsistent.

Functions

Symbol	Import	Summary
acos	from cadflow import acos	Public function in this domain.
analyze_tolerance	from cadflow import analyze_tolerance	Propagate source manufacturing tolerances through a scalar expression.
asin	from cadflow import asin	Public function in this domain.
atan	from cadflow import atan	Public function in this domain.
atan2	from cadflow import atan2	Public function in this domain.
canonical_unit_for_dimension	from cadflow import canonical_unit_for_dimension	Return the canonical unit used by CAD and tolerance calculations.
check_tolerance	from cadflow import check_tolerance	Propagate and verify one Length or Angle requirement.
const	from cadflow import const	Create a constant scalar node for parameterized modeling.
convert_value	from cadflow import convert_value	Convert a finite numeric value between dimensionally compatible units.
cos	from cadflow import cos	Public function in this domain.
expression_uses_units	from cadflow import expression_uses_units	Return whether an expression contains an explicit unit declaration.
get_unit	from cadflow import get_unit	Resolve a built-in unit name/alias or return an existing Unit.
infer_dimension	from cadflow import infer_dimension	Infer and validate an expression's result dimension.
sin	from cadflow import sin	Public function in this domain.
sqrt	from cadflow import sqrt	Public function in this domain.
tan	from cadflow import tan	Public function in this domain.
var	from cadflow import var	Create a physical or legacy scalar variable.

Constants

Symbol	Import	Summary
ANGLE	from cadflow import ANGLE	Physical dimension represented by integer length and angle exponents.
AREA	from cadflow import AREA	Physical dimension represented by integer length and angle exponents.
CM	from cadflow import CM	Named unit with a scale to CadFlow's canonical numeric units.
CUBIC_CM	from cadflow import CUBIC_CM	Named unit with a scale to CadFlow's canonical numeric units.
CUBIC_FOOT	from cadflow import CUBIC_FOOT	Named unit with a scale to CadFlow's canonical numeric units.
CUBIC_INCH	from cadflow import CUBIC_INCH	Named unit with a scale to CadFlow's canonical numeric units.
CUBIC_M	from cadflow import CUBIC_M	Named unit with a scale to CadFlow's canonical numeric units.
CUBIC_MM	from cadflow import CUBIC_MM	Named unit with a scale to CadFlow's canonical numeric units.
DEGREE	from cadflow import DEGREE	Named unit with a scale to CadFlow's canonical numeric units.
DIMENSIONLESS	from cadflow import DIMENSIONLESS	Physical dimension represented by integer length and angle exponents.
FOOT	from cadflow import FOOT	Named unit with a scale to CadFlow's canonical numeric units.
INCH	from cadflow import INCH	Named unit with a scale to CadFlow's canonical numeric units.
LENGTH	from cadflow import LENGTH	Physical dimension represented by integer length and angle exponents.
M	from cadflow import M	Named unit with a scale to CadFlow's canonical numeric units.
MM	from cadflow import MM	Named unit with a scale to CadFlow's canonical numeric units.
ONE	from cadflow import ONE	Named unit with a scale to CadFlow's canonical numeric units.
PERCENT	from cadflow import PERCENT	Named unit with a scale to CadFlow's canonical numeric units.
RADIAN	from cadflow import RADIAN	Named unit with a scale to CadFlow's canonical numeric units.
SQUARE_CM	from cadflow import SQUARE_CM	Named unit with a scale to CadFlow's canonical numeric units.
SQUARE_FOOT	from cadflow import SQUARE_FOOT	Named unit with a scale to CadFlow's canonical numeric units.
SQUARE_INCH	from cadflow import SQUARE_INCH	Named unit with a scale to CadFlow's canonical numeric units.
SQUARE_M	from cadflow import SQUARE_M	Named unit with a scale to CadFlow's canonical numeric units.
SQUARE_MM	from cadflow import SQUARE_MM	Named unit with a scale to CadFlow's canonical numeric units.
VOLUME	from cadflow import VOLUME	Physical dimension represented by integer length and angle exponents.