code: function (id) {
          var filtered = instance.matrix.data.filter(function (cell) {
            if (cell.deps) {
              return cell.deps.indexOf(id) > -1;
            }
          });
  
          var deps = [];
          filtered.forEach(function (cell) {
            if (deps.indexOf(cell.id) === -1) {
              deps.push(cell.id);
            }
          });
  
          return deps;
        }
docs: get dependencies by element
  @param {String} id
  @returns {Array}