Blocking math [Obj,Int]

Description

Executes a free math expression on the values of the second column, for matching objects (according to the PAIRS input).

Warning: this block can fail if the expression is invalid (e.g. referring to a non available mathematical function), or if the expressions computes to invalid results (e.g. division by zero).

Input

  • A [OBJ,INTEGER]: a list of pairs

  • PAIRS: Pairs of A (first column) and B (second column) objects for which to compute the expression

  • B [OBJ,INTEGER]: a list of pairs

Output

  • RESA [OBJ,INTEGER]: result of the operation, with matching objects from A

  • RESB [OBJ,INTEGER]: result of the operation, with matching objects from B

Parameters

  • Expression: the mathematical expression to compute

    • use $A and $B to refer to the values comings from inputs A and B

    • arithmetic operators and common mathematical functions can be used

    • the expression is evaluated by the database engine. See MonetDB Functions and Operators for a full list of functions and operators available.