ExpressionExtensions

Full name Microsoft.VisualBasic.Math.Lambda.Symbolic.ExpressionExtensions Assembly Microsoft.VisualBasic.Math.Lambda Members 9

Shared helpers that operate on the immutable Expression tree. All transformations are functional: they return a new node and never mutate the input tree.

01 Syntax

Microsoft.VisualBasic.Math.Lambda.Symbolic.ExpressionExtensions

02 Methods

Name	Overloads	Summary
Clone	1	Make a deep copy of the given expression node.
ExprEquals	1	Compare two expression trees structurally (ignoring parentheses which are not represented in the tree).
GetSymbols	1	All distinct variable symbol names that appear in the expression.
IsConstant	1	Test if the expression contains no variable symbols (i.e.
DependsOn	1	Test if the expression still references the given variable symbol.
FlattenSum	1	Flatten nested additions into a list of summands.
FlattenProduct	1	Flatten nested multiplications into a list of factors.
SplitCoefficient	1	Split a term into a numeric coefficient and the remaining body, such that term = coeff * body.
NumericValue	1	If the expression is a literal number, returns its value; otherwise returns Nothing.

03 Members

method Clone #

Clone(Expression)

Make a deep copy of the given expression node.

method ExprEquals #

ExprEquals(Expression, Expression)

Compare two expression trees structurally (ignoring parentheses which are not represented in the tree).

method GetSymbols #

GetSymbols(Expression)

All distinct variable symbol names that appear in the expression.

method IsConstant #

IsConstant(Expression)

Test if the expression contains no variable symbols (i.e. it is a pure constant that can be evaluated numerically).

method DependsOn #

DependsOn(Expression, String)

Test if the expression still references the given variable symbol.

method FlattenSum #

FlattenSum(Expression)

Flatten nested additions into a list of summands. A subtraction a - b is represented as a + (-b).

method FlattenProduct #

FlattenProduct(Expression)

Flatten nested multiplications into a list of factors. A division a / b is represented as a * (1/b).

method SplitCoefficient #

SplitCoefficient(Expression, Double, Expression)

Split a term into a numeric coefficient and the remaining body, such that term = coeff * body. Only a leading numeric factor is recognised: 2*x^2 yields coeff=2, body=x^2; x*2 yields coeff=2, body=x.

method NumericValue #

NumericValue(Expression)

If the expression is a literal number, returns its value; otherwise returns Nothing.