Conditional OR and AND in same statement?

[firefly2442]

Can I have a conditional "OR" and "AND" in the same trigger statement? For example:

 

if (unit 1 in zone OR unit 2 in zone) AND (FLAG 2 ON)

 

I know it can be done in Lua but in just the editor itself?

[ajax]

Yes, but it's kind of a pain.

 

By default, the logical operation is AND between each line. Use the OR button to start a new block of AND conditions. This example is not that bad, but you can imagine it can get messy real quick if you add many more conditions.

unit 1 in zone

flag2 is on

OR

unit2 in zone

flag2 is on

 

Or in plain language: (Unit1 in zone AND flag2 is on) OR (Unit2 in zone AND flag2 is on) -- which is logically equivalent.

Edited June 2, 2014 by ajax

[Flagrum]

Yes, but it's kind of a pain.

 

By default, the logical operation is AND between each line. Use the OR button to start a new block of AND conditions. This example is not that bad, but you can imagine it can get messy real quick if you add many more conditions.

unit 1 in zone

flag2 is on

OR

unit2 in zone

flag2 is on

 

Or in plain language: (Unit1 in zone AND flag2 is on) OR (Unit2 in zone AND flag2 is on) -- which is logically equivalent.

 

I think, the OPs question is more targetted at the precedence of the operators. Taken your example, what about

Unit1 in zone AND ( flag2 is on OR Unit2 in zone ) AND flag2 is on

[baltic_dragon]

Can I have a conditional "OR" and "AND" in the same trigger statement? For example:

 

if (unit 1 in zone OR unit 2 in zone) AND (FLAG 2 ON)

 

I know it can be done in Lua but in just the editor itself?

 

I think you just need to use the following:

 

Unit1 in Zone

Flag2 ON

[or]

Unit2 in Zone

Flag2 ON

 

Since in your example Flag2 had to be true for both.

[sobek]

Since in your example Flag2 had to be true for both.

 

That is the same boolean statement, but in his example Flag2 is singled out, which is mathematically considered to be the more simplified state of the whole statement.

[ajax]

I think, the OPs question is more targetted at the precedence of the operators. Taken your example, what about

Unit1 in zone AND ( flag2 is on OR Unit2 in zone ) AND flag2 is on

 

If the statement can be expressed in suitable form, then yes it can be done--which was the OP's question. In your example the equivalent form for the ME would be:

 

Unit1 in zone

Flag2 ON

OR

Unit1 in zone

Unit2 in zone

Flag2 ON

 

The key is to break it down into a series of binary comparisons using the associative and distributive properties of Boolean math.

 

You can always generate a Truth Table to check for equivalency.

 

Edit: I actually stopped too soon: The simplest equivalent form is:

 

Unit1 in zone

Flag2 ON

Edited June 2, 2014 by ajax

[sobek]

You can always generate a Truth Table to check for equivalency.

 

+1

 

It is often astounding how much you can condense your boolean statements by just using a truth table. There are some (relatively simple) algorithms for more complex statements, but that would probably be out of scope for this thread.

 

Edit:

 

Unit1 in zone

Flag2 ON

OR

Unit1 in zone

Unit2 in zone

Flag2 ON

 

Didn't you forget

OR
Unit 2 in zone
FLAG 2 ON

?

 

Edit2: Ah i misread your post, i thought you were going off of the original statement instead of Flagrums.

Edited June 2, 2014 by sobek

[ajax]

No, I actually didn't. It turns out Unit2 in zone is irrelevant to the "truthness" or "falseness" of the statement as a whole.

[sobek]

No, I actually didn't. It turns out Unit2 in zone is irrelevant to the "truthness" or "falseness" of the statement as a whole.

 

Yes, sorry about that, see my edit. However i feel that it should be noted that Flagrums example and that of the OP are not equivalent.

[ajax]

Yes, I saw your edit after I already posted.:)

 

It definitely is important to realize that the two examples are different

[Home Fries]

You could also break the statement up into two triggers like so:

If

unit 1 in zone
OR
unit 2 in zone

Then

FLAG(1) = 1

then the next statement could be

If

FLAG(1) TRUE
FLAG(2) TRUE

then execute your trigger

 

This is a bit unwieldy for two steps, but if you needed a matrix (similar to Sobek's truth table example) you could create a trigger with flag for each row or column (i.e. each condition) and then triggers based on flags in each of the cells in the matrix (i.e. each action).

 

EDIT: if the triggers with flags have "expiration" (i.e. in your example, if both units leave the area) you will need to add another trigger:

If

unit 1 not in zone
unit 2 not in zone

Then

FLAG(1) = 0

Edited June 2, 2014 by Home Fries

[firefly2442]

Thanks for the replies all. Definitely had some flashbacks to classes long ago regarding truth tables. ;)