dc.js：减少数据表中的行

问题描述

所以我有一个 data.table 对象，它的输出如下：

So I have a data.table object that is being outputed like this:

gender  hair-color  pets  group1.totals   group2.totals   group3.totals
  F       black      Y       10               0                 0
  F       black      Y        0               7                 0
  F       black      Y        0               0                 8

如何折叠它，使其像这样？

How do I collapse it so that it will be like this?

  gender  hair-color  pets  group1.totals   group2.totals   group3.totals
    F       black      Y         10               7                 8

我尝试缩小尺寸，但似乎不起作用。我的代码如下：

I have tried reducing the dimensions but it doesn't seem to work. My code is below:

ndx = crossfilter(data);
dataTable = dc.dataTable('#data-table');
var tableDim = ndx.dimension(function(d) {
    return d.gender + "/" + d.hair-color + "/" + d.pets;
      });

dataTable
   .width(400)
   .height(800)
   .dimension(tableDim)
   .group(function(d){
     return "Data Counts";
    }),
   .columns([
      function(d) {
        return d.gender;
       },
      function(d) {
        return d.hair-color;
       },
      function(d) {
        return d.pets;
      }
      function(d) {
        if (d.group == 1) return d.totals;
          else return 0;
      },
      function(d) {
        if (d.group == 2) return d.totals;
          else return 0;
      },
      function(d) {
        if (d.group == 3) return d.totals;
          else return 0;

基本上我知道我必须减少并分组我的数据，但我无法具体找到要实现的目标。谢谢，任何帮助都会很棒！

Essentially I know that I have to reduce and group my data but I can't find specifically what I have to do in order to achieve. Any help would be great, thanks!

推荐答案

使用以下代码；

var ndx=crossfilter(data);
var dimension=ndx.dimension(function(d){return d.hair-color});
var dataByHairColor=dimension.group().reduceCount();

我希望它能解决问题。如果您想要其他过滤选项，请使用该选项。我用染发剂。让我知道您是否仍然遇到问题

I hope it'll solve the problem. If you want other filtering option use that. I used hair color. Let me know if you are still facing issues

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