public double[] subarray_as_radians_phase_of_Phasor(int start, int end){
        if(end>=this.length)throw new IllegalArgumentException("end, " + end + ", is greater than the highest index, " + (this.length-1));
        Phasor[] pp = this.getArray_as_Phasor();
        double[] phaser = new double[end-start+1];
        for(int i=start; i<=end; i++)phaser[i-start] = pp[i].getPhaseInRadians();
        return phaser;
    }