线性插值

线性插值

    public static void interpolate(List<Double> list) {
        int start = -1;
        for (int i = 0; i < list.size(); i++) {
            if (list.get(i) == null) continue;
            if (start != -1) {
                int count = i - start;
                if (count > 1) {
                    double delta = (list.get(i) - list.get(start)) / count;
                    for (int j = start + 1; j < i; j++) {
                        list.set(j, list.get(j - 1) + delta);
                    }
                }
            }
            start = i;
        }
    }

测试

    public static void main(String[] args) {
        List<Double> list = new ArrayList<>();
        list.add(null);
        list.add(1d);
        list.add(null);
        list.add(3d);
        list.add(null);
        list.add(6d);
        list.add(6d);
        list.add(null);
        list.add(null);
        interpolate(list);
        for (Double aDouble : list) {
            System.out.println(aDouble);
        }
    }

输出

null
1.0
2.0
3.0
4.5
6.0
7.0
null
null