# 14.2.14 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
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.

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

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

Return
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.

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


Get a slice of the expression.

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.toString
toString() -> str


Return a string representation of the expression object.

Return

(str)