My experiment works locally, but online I get different errors such as initialising the experiment and unknown resource errors

Online experiments
21

Ahhh, that makes sense now! I think it’s not too hard to adapt my js code to these specifications. Essentially you just have to run it four times. Once for each chunk. You can use https://jsfiddle.net/ to test your js code. (you just have to add console.log(stims) to the code to get an output of what your stims array looks like)

1 Like
22

Thank you for the recommendation with jsfiddle.net. That makes it a lot easier and I found a solution based on your code. In case anyone else should be interested it is:

// function for shuffling
function shuffle(array) {
  var copy = [], n = array.length, i;

  // While there remain elements to shuffle…
  while (n) {

    // Pick a remaining element…
    i = Math.floor(Math.random() * array.length);

    // If not already shuffled, move it to the new array.
    if (i in array) {
      copy.push(array[i]);
      delete array[i];
      n--;
    }
  }

  return copy;
}


// function for generating a sequence
function range(start, end) {
          return Array(end - start + 1).fill().map((_, idx) => start + idx)
      }
            
numimg = 192;
letter1 = new Array(numimg / 16).fill([".jpg", "_06_03.jpg", "_07_03.jpg", "_08_03.jpg"]).flat();
letter2 = new Array(numimg / 16).fill([".jpg", "_06_03.jpg", "_07_03.jpg", "_08_03.jpg"]).flat();
letter3 = new Array(numimg / 16).fill([".jpg", "_06_03.jpg", "_07_03.jpg", "_08_03.jpg"]).flat();
letter4 = new Array(numimg / 16).fill([".jpg", "_06_03.jpg", "_07_03.jpg", "_08_03.jpg"]).flat();

letter1 = shuffle(letter1);
letter2 = shuffle(letter2);
letter3 = shuffle(letter3);
letter4 = shuffle(letter4);

console.log(letter1)


// generate image array
imagearray  = range(1, numimg)
imagearray = shuffle(imagearray);

distortion = letter1.concat(letter2).concat(letter3).concat(letter4)

// merge both arrays element by element to get the final stim array
stims = [imagearray , distortion ].reduce((a, b) => a.map((v, i) => v + b[i]))

// shuffle
stims = shuffle(stims)

I really appreciate your input. I may have some future tweaks, but they will probably be relevant for a new topic.