delete a whole subset from the root set

[Gabriela G.]

I fill a subset inside a procedure and I want to delete the elements in this subset in the root set.

Subset := { };

if(something)then

Subset +=ElementCast(Set,s);

endif;

for(k in Subset)do

Set -= s;

endfor; 

 

It works for the first element in the subset, but it doesn´t delete the other elements. 

[Mohan]

Hello Gabriela,

Just wanted to confirm if your "Subset" a subset of "Set" ? As you are using ElementCast, I am assuming that Subset is an unrelated set to Set.

The code inside your for loop should be

Set -= k

You are iterating over k but deleting the element s. The value of s is not changing.

[Gabriela G.]

Subset is a subset of Set, I use ElementCast because I thought it was necessary.

I use 

for(k in Subset)do

Set -= k;

endfor; 

And it only deletes the first element.

[Mohan]

Hi Gabriela,

If Subset is a subset of Set, then removing k from Set will also remove it from the subset.

May I ask what are you trying to achieve here so that I could recommend an approach ?

[Gabriela G.]

Yes, I know that it would delete the element from the subset, but I want to delete all the elements from the subset in the root set, it doesn't matter if the subset ends up being empty.

I'm trying to delete multiple elements from a set and that's the only idea I had.

El viernes, 10 de mayo de 2019, 15:25:53 (UTC-5), Gabriela G. escribió:

[Mohan]

Ok, can you try the below code ?

Set -= {s | s in Subset}