多个数组元素的总和，并按索引 (x,y) 将此总和放入 table

Question

我有以下数据（由ajax加载）：

[
  {
    "x":     [1, 1, 2, 2, 2, 3, 3, 3, 4, 5],
    "y":     [3, 5, 4, 2, 5, 3, 4, 5, 1, 5],
    "Value": [18, 15, 11, 12, 9, 2, 33, 12, 2, 4],
  },
  {
    "x":     [1, 1, 2, 2, 2, 3, 3, 3, 4, 5],
    "y":     [3, 5, 4, 2, 5, 3, 4, 5, 1, 5],
    "Value": [16, 15, 11, 12, 9, 2, 33, 12, 2, 4],
  },
  {
    "x":     [1, 1, 2, 2, 2, 3, 3, 3, 4, 5],
    "y":     [3, 5, 4, 2, 5, 3, 4, 5, 1, 5],
    "Value": [14, 15, 11, 12, 9, 2, 33, 12, 2, 4],
  }
]

我有 a 5x5 table.

如何计算 "value" 的每个多个元素的总和并将其放在右索引的 table 中？

我现在的 js 代码：

function risk(data) {
    let sum = 0;

    for (i = 0; i < data.length; i++) {
      let b = data[i].Value;
      console.log(b); // (10) [18, 15, 11, 12, 9, 2, 33, 12, 2, 4]
                      // (10) [16, 15, 11, 12, 9, 2, 33, 12, 2, 4]
                      // (10) [14, 15, 11, 12, 9, 2, 33, 12, 2, 4]
    }
}

最后的结果一定是这样的：

Answer 1

您可以使用 reduce 构建 "result" 矩阵，在迭代时将 "Value" 添加到矩阵中适当的 x 和 y 坐标通过原始数据中的所有元素。

const data = [
  {
    "x":     [1, 1, 2, 2, 2, 3, 3, 3, 4, 5],
    "y":     [3, 5, 4, 2, 5, 3, 4, 5, 1, 5],
    "Value": [18, 15, 11, 12, 9, 2, 33, 12, 2, 4],
  },
  {
    "x":     [1, 1, 2, 2, 2, 3, 3, 3, 4, 5],
    "y":     [3, 5, 4, 2, 5, 3, 4, 5, 1, 5],
    "Value": [16, 15, 11, 12, 9, 2, 33, 12, 2, 4],
  },
  {
    "x":     [1, 1, 2, 2, 2, 3, 3, 3, 4, 5],
    "y":     [3, 5, 4, 2, 5, 3, 4, 5, 1, 5],
    "Value": [14, 15, 11, 12, 9, 2, 33, 12, 2, 4],
  }
];

const res = new Array(5).fill(0).map(n => new Array(5).fill(0));
data.reduce((acc, curr) => {
  curr.Value.forEach((v, i) => acc[curr.x[i] - 1][curr.y[i] - 1] += v);
  return res;
}, res);

console.log(res);

Answer 2

你可以拿一个对象来收集这些值。为了将结果返回到 table，您可以迭代坐标并获得一个值。

var data = [{ x: [1, 1, 2, 2, 2, 3, 3, 3, 4, 5], y: [3, 5, 4, 2, 5, 3, 4, 5, 1, 5], Value: [18, 15, 11, 12, 9, 2, 33, 12, 2, 4] }, { x: [1, 1, 2, 2, 2, 3, 3, 3, 4, 5], y: [3, 5, 4, 2, 5, 3, 4, 5, 1, 5], Value: [16, 15, 11, 12, 9, 2, 33, 12, 2, 4] }, { x: [1, 1, 2, 2, 2, 3, 3, 3, 4, 5], y: [3, 5, 4, 2, 5, 3, 4, 5, 1, 5], Value: [14, 15, 11, 12, 9, 2, 33, 12, 2, 4] }],
    sum = data.reduce((r, {x, y, Value}) => 
        (x.forEach((x, i) => {
        r[x] = r[x] || {};
        r[x][y[i]] = (r[x][y[i]] || 0) + Value[i];
    }), r), {});
    
console.log(sum);

多个数组元素的总和，并按索引 (x,y) 将此总和放入 table

Sum of multiple array elements and put this sum in table by index (x,y)

javascript

arrays

sum

count

tabular