id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
515	New funcion Append in Set	Jorge	Víctor de Buen Remiro	"I'd like to propose a new function to Append elements to an existing Set.

One common situation is when we process one Set A and create k new Sets A1,...,Ak. Normally we can use EvalSet k times to create each A_i or we use one EvalSet that iterate over all elements of A and create the tuples (a1i,...,aki) then use an EvalSet to build Aj selecting the corresponding component in the previous tupple.

We can also use only one EvalSet and use := in combination with the operator << 

    Ai := Ai << aij;

but this imply that Ai is destroyied and created every time one more element is added. This could be inneficient in terms of time and memory management.

We think that a function that append and element to an existing Set variable will overcome the previous situation:

  Set Append(Set A, Anything item)

the result of that function should be A.

best regards,

Jorge"	enhancement	closed	highest		SetAlgebra	head	minor	fixed