Question

我正在尝试获取此数据集中“ min”列的平均值：

var data = [{
    name: "Site A",
    max: 202,
    min: 0,
    var: 202,
    x: 1,
    product: "Diesel",
    case: "Base Case"
  },
  {
    name: "Site B",
    max: 145,
    min: 147,
    var: -2,
    x: 0,
    product: "Diesel",
    case: "Base Case"
  },
  {
    name: "Site C",
    max: 221,
    min: 238,
    var: -17,
    x: 0,
    product: "Diesel",
    case: "Base Case"
  }]

您能告诉我我该怎么做吗？>

Answer 1

您可以使用d3.mean()，它将访问器函数作为第二个参数。该访问器函数将呈现给数组中的每个对象，并用于从中提取.min属性。

const average = d3.mean(data, d => d.min);

看看这个工作演示：

var data = [{
    name: "Site A",
    max: 202,
    min: 0,
    var: 202,
    x: 1,
    product: "Diesel",
    case: "Base Case"
  },
  {
    name: "Site B",
    max: 145,
    min: 147,
    var: -2,
    x: 0,
    product: "Diesel",
    case: "Base Case"
  },
  {
    name: "Site C",
    max: 221,
    min: 238,
    var: -17,
    x: 0,
    product: "Diesel",
    case: "Base Case"
  }];
  
const average = d3.mean(data, d => d.min);

console.log(average);

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>

获取数组中对象的平均值

1 个答案: