astnodes¶

Construction of formulas as libsbml ASTs.

The converter keeps every formula as the AST libsbml reads from the model and builds the new ones (reaction terms, amounts, rates) from nodes. A formula as text in the syntax of libsbml cannot tell an id from a symbol of the syntax: a parameter avogadro, pi or NaN would be read back as the constant.

name ¶

name(sid)

The reference to the element of an id, never a symbol of that name.

number ¶

number(value, units=None)

A real number, infinity and NaN included.

Parameters:

Name	Type	Description	Default
`value`	`float`	the value.	required
`units`	`str \| None`	id of the SBML units of the number, none when `None`.	`None`

apply ¶

apply(operator, *arguments)

An operator or function applied to copies of its arguments.

Parameters:

Name	Type	Description	Default
`operator`	`int`	type of the node, e.g. `libsbml.AST_TIMES`.	required
`arguments`	`ASTNode`	the arguments in their order, they are not changed.	`()`

signed_sum ¶

signed_sum(terms)

The sum of terms which are added (AST_PLUS) or subtracted (AST_MINUS).

Parameters:

Name	Type	Description	Default
`terms`	`list[tuple[int, ASTNode]]`	sign and term, at least one; the terms are not changed and every term is copied once, whatever the number of terms.	required

Returns:

Type	Description
`ASTNode`	`((-a + b) - c) ...`, the terms in their order.

text ¶

text(node)

The formula in the syntax of libsbml, for logs and messages only.