Need logical calculation/control actor suggestion

  • Hi all,

    I am trying to find the right actor to interpret more than one value of "if then": I have 8 sensors each outputting 1 when on, 0 when off. I'm trying to find an actor that can do "if all 8 values are 0, then output 1 or trigger".

    I've tried the Lookup actor, but it doesn't seem to do what I want.

    I'm sure this is quite easy, but I can't seem to find the right actor for it.

    Thanks very much

  • Tech Staff

    Comparator actor?  6d0d65-screen-shot-2014-10-21-at-16.56.12.png

  • Hi @Skulpture,

    I need to compare 8 values though. If all 8 values = 0 then output 1.

    If there any actor that can compare more than 1 values?


  • Tech Staff


    this is quite easy: use four calculator actors for the input values, then another two to get the summary of two pairs and another one to get the summary from them. Then take a comparator actor that is looking for zero, if zero then the output is one otherwise zero. See attached image.


  • Seems like an ideal place for the javascript actor.

    Also very minor bug report - it says compatator in the help for the comparator actor (see Skulptures post above)

  • Michel was faster...

  • @[Michel]( 
    YES!!! This is it! So simple, but need intelligent brains to show me the way. Thanks so much!

  • Or paste the following into a javascript actor with 8 inputsfunction main(){ total=0; for (i=0;i<8;i++) { total+=arguments[i] } return total>0; }

  • Tech Staff

    Well spotted @gavspav ;)

  • Tech Staff

    The javascript method is great.

    But another very simple one can be setup using the 'Lookup' actor.
    It will output 0 if the 'compare' input is not found in the X (eight for this case) inputs.
    Otherwise it will say which input matches the 'compare'
    If your binary values run into eight value inputs, and you compare '1', you will receive a '0' if all of your eight values are not 1, and a value between 1 and 8 if there is a match.

  • Thats great too!

    Another way - how about the Maximum actor with 8 inputs. 
    The advantage of this is that the 8 value inputs are 'active' - with the lookup actor you have to keep sending '1' to the compare input every time you want the actor to do its thing.
    Sorry if I'm getting a bit anal. On the same note here's a rewrite of the javascript:
    function main()
    for (i=0;i<8;i++) {
    	if (arguments[i]==1) {
    		return 1;
    return 0;

  • Tech Staff


    yep the maximum actor is even simpler to setup.

  • Tech Staff


    yes,Maximum is an easier choice than lookup.
    Its probably the easiest native Isadora solution.

  • Wow, thank you @DusX & @Michel!
    I didn't know about the Maximum actor. this is so great! yes, the easiest solution! thanks so much.

  • and thank you @gavspav 

    I just realized you've already suggested it as well. i'll try the javascript actor too, just for fun. cheers.

  • Tech Staff


    the tutorial on Javascript for Isadora might be worth a read.

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