private static void fft(Complex[][] series) {
        for (int i = 0; i < series.length; i++) {
            int count = (int)Math.pow(2, Math.floor(Math.log10(series[i].length) / Math.log10(2)));
            Complex[] row = new Complex[count];
            for (int j = 0; j < row.length; j++) {
                row[j] = series[i][j];
            }
            FFT.fft(row);
            Complex[] temp = new Complex[row.length / 2];
            for (int j = 0; j < temp.length; j++) {
                temp[j] = row[j];
            }
            series[i] = temp;
        }
    }