14.2.15 Class Expression

mosek.fusion.Expression

Abstract base class for all objects which can be used as linear expressions of the form \(Ax+b.\)

The main use of this class is to store the result of expressions created by the static methods provided by Expr.

Members

Expression.eval – Evaluate the expression and push the result onto the work stack.

Expression.getDim – Return the d’th dimension in the expression.

Expression.getND – Return the number of dimensions in the expression.

Expression.getShape – Get the shape of the expression.

Expression.getSize – Return the total number of elements in the expression (the product of the dimensions).

Expression.index ([]) – Get a single element in the expression.

Expression.pick ([]) – Pick a number of elements from the expression.

Expression.slice ([]) – Get a slice of the expression.

Expression.toString – Return a string representation of the expression object.

Implemented by

BaseExpression, Parameter, Variable

Expression.eval
eval(WorkStack rs, WorkStack ws, WorkStack xs)

Evaluate the expression and push the result onto the rs work stack.

Parameters

  • rs (WorkStack) – The stack where the result of the evaluation is stored.

  • ws (WorkStack) – The stack used by evaluation to perform intermediate computations. It will be returned in the same state as when the function is called.

  • xs (WorkStack) – An auxiliary stack.

Expression.getDim
getDim(int d) -> int

Return the d’th dimension in the expression.

Parameters

d (int)

Return

(int)

Expression.getND
getND() -> int

Return the number of dimensions in the expression.

Return

(int)

Expression.getShape
getShape() -> int[]

Get the shape of the expression.

Return

(int[])

Expression.getSize
getSize() -> int

Return the total number of elements in the expression (the product of the dimensions).

Return

(int)

Expression.index ([])
index(int i) -> Expression
index(int[] indexes) -> Expression

Get a single element in the expression.

The standard Python operator [] can also be used for this purpose. See Sec. 14.1.3 (Pythonic extensions) for details.

Parameters

  • i (int) – Index of the element to pick.

  • indexes (int[]) – Multi-dimensional index of the element to pick.

Return

(Expression)

Expression.pick ([])
pick(int[] indexes) -> Expression
pick(int[][] indexrows) -> Expression

Picks a number of elements from the expression and returns them as a one-dimensional expression.

The standard Python operator [] can also be used for this purpose. See Sec. 14.1.3 (Pythonic extensions) for details.

Parameters

  • indexes (int[]) – Indexes of the elements to pick

  • indexrows (int[][]) – Indexes of the elements to pick. Each row defines a separate multi-dimensional index.

Return

(Expression)

Expression.slice ([])
slice(int first, int last) -> Expression
slice(int[] firsta, int[] lasta) -> Expression

Get a slice of the expression.

The standard Python operator [] can also be used for this purpose. See Sec. 14.1.3 (Pythonic extensions) for details.

Parameters

  • first (int) – Index of the first element in the slice.

  • last (int) – Index of the last element in the slice plus one.

  • firsta (int[]) – Multi-dimensional index of the first element in the slice.

  • lasta (int[]) – Multi-dimensional index of the element after the end of the slice.

Return

(Expression)

Expression.toString
toString() -> str

Return a string representation of the expression object.

Return

(str)