functie

 var getMatrices = function () {
        var matrixData = getJsonTypes('matrices');
        var matrixArray = [];
        for(var currentMatrix in matrixData) {
            var cmObj = matrixData[currentMatrix];
            for (var accent in cmObj.accent) {
                var aObj = cmObj.accent[accent];
                for (var igp in aObj.igp) {
                    var igObj = aObj.igp[igp];
                    for (var idea in igObj.idea) {
                        var idObj = igObj.idea[idea];
                        matrixArray.push(idObj);
                    }
                }
            }
        }
        return matrixArray;
    };