d3：绘制为累积图 [英] d3: Plot as a cumulative graph

问题描述

d3 是否有内置方法将数据集绘制为累积图？

Does d3 have a built in method to plot a data set as a cumulative graph?

例如，如果y值是： [2，4，2，2] ，我想让它们实际上绘制为： [2，6，8，10] 。 d3有一个方法可以做到这一点，或者我必须遍历数据集并手动执行吗？

For example, if the y values are: [2, 4, 2, 2], I want them to actually be plotted as: [2, 6, 8, 10]. Does d3 have a way to do this or would I have to traverse the data set and do this manually?

推荐答案

https://github.com/mbostock/d3/wiki/Arrays 了解详情，但我想你可以在这里使用reduce（）函数。

You can check https://github.com/mbostock/d3/wiki/Arrays for more info but I think you can use the reduce() function here.

ie：

[0, 2, 4, 2, 2].reduce(function(previousValue, currentValue, currentIndex, array) {
  console.log(previousValue + currentValue);//2,6,8,10
  return previousValue + currentValue;
});

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