在javascript中将数组绑定为直方图 [英] Binning an array in javascript for a histogram

问题描述

我在Javascript中有下面的数组，我需要将其分成20个存储桶.数据值介于0和1之间，因此bin大小将为0.05.我觉得应该有一个函数接受两个参数，一个数组和一个bin大小，但是我找不到一个.我知道D3.js具有一些有助于构建这样的数组的功能，但是我无法弄清楚哪个功能可能会有所帮助.

var arr = [
  "0.362743", "0.357969", "0.356322", "0.355757", "0.358511",
  "0.357218", "0.356696", "0.354579", "0.828295", "0.391186",
  "0.378577", "0.39372", "0.396416", "0.395641", "0.37573",
  "0.379666", "0.377443", "0.391842", "0.402021", "0.377516",
  "0.38936", "0.38936", "0.400883", "0.393171", "0.374419",
  "0.400821", "0.380502", "0.396098", "0.388256", "0.398968",
  "0.392525", "0.401858", "0.387297", "0.376471", "0.378183",
  "0.379787", "0.382024", "0.387928", "0.395367", "0.391972",
  "0.381295", "0.391183", "0.383598", "0.386424", "0.384338",
  "0.401834", "0.406253", "0.392854", "0.399266", "0.400804",
  "0.391146", "0.395441", "0.396265", "0.397894", "0.384822",
  "0.385181", "0.395443", "0.400981", "0.401716", "0.406633",
  "0.406887", "0.40694", "0.391219", "0.387946", "0.398858",
  "0.402233", "0.388583", "0.389772", "0.397084", "0.711566",
  "0.954557", "0.524007", "0.672288", "0.668441", "0.421726",
  "0.549536", "0.932952", "0.397851", "0.395536", "0.354818",
  "0.374355", "0.375257", "0.362613", "0.391271", "0.379219",
  "0.363316", "0.866006", "0.862254", "0.864403", "0.861346",
  "0.845225", "0.784467", "0.801275", "0.638579", "0.847282",
  "0.847402", "0.847747", "0.790411", "0.835979", "0.838546"
]

解决方案

随着D3.js v4的发布，d3.layout.histogram已成为 d3.histogram()现在属于 d3-array 模块. >

要对阵列进行装箱，请创建一个直方图生成器:

var histGenerator = d3.histogram()
  .domain([0,1])    // Set the domain to cover the entire intervall [0,1]
  .thresholds(19);  // number of thresholds; this will create 19+1 bins

还有其他一些选项可用于配置阈值，从而配置垃圾箱，但是该生成器将完全满足您的要求.通过使用值数组调用生成器，可以将计算出的bin检索为数组:

var bins = histGenerator(arr);

看看这个工作示例:

 var arr = [
  "0.362743", "0.357969", "0.356322", "0.355757", "0.358511",
  "0.357218", "0.356696", "0.354579", "0.828295", "0.391186",
  "0.378577", "0.39372", "0.396416", "0.395641", "0.37573",
  "0.379666", "0.377443", "0.391842", "0.402021", "0.377516",
  "0.38936", "0.38936", "0.400883", "0.393171", "0.374419",
  "0.400821", "0.380502", "0.396098", "0.388256", "0.398968",
  "0.392525", "0.401858", "0.387297", "0.376471", "0.378183",
  "0.379787", "0.382024", "0.387928", "0.395367", "0.391972",
  "0.381295", "0.391183", "0.383598", "0.386424", "0.384338",
  "0.401834", "0.406253", "0.392854", "0.399266", "0.400804",
  "0.391146", "0.395441", "0.396265", "0.397894", "0.384822",
  "0.385181", "0.395443", "0.400981", "0.401716", "0.406633",
  "0.406887", "0.40694", "0.391219", "0.387946", "0.398858",
  "0.402233", "0.388583", "0.389772", "0.397084", "0.711566",
  "0.954557", "0.524007", "0.672288", "0.668441", "0.421726",
  "0.549536", "0.932952", "0.397851", "0.395536", "0.354818",
  "0.374355", "0.375257", "0.362613", "0.391271", "0.379219",
  "0.363316", "0.866006", "0.862254", "0.864403", "0.861346",
  "0.845225", "0.784467", "0.801275", "0.638579", "0.847282",
  "0.847402", "0.847747", "0.790411", "0.835979", "0.838546"
];

var histGenerator = d3.histogram()
  .domain([0,1])    // Set the domain to cover the entire intervall [0;]
  .thresholds(19);  // number of thresholds; this will create 19+1 bins

var bins = histGenerator(arr);
console.log(bins); 

 <script src="http://d3js.org/d3.v4.js"></script> 

I have below array in Javascript which I need to bin into 20 buckets. The data values are between 0 and 1, so the bin size would be .05. I feel like there should be a function out there that takes two arguments, an array and a bin size, but I cannot find one. I know that D3.js has some feature that help building such an array, but I cannot figure out which function might help.

var arr = [
  "0.362743", "0.357969", "0.356322", "0.355757", "0.358511",
  "0.357218", "0.356696", "0.354579", "0.828295", "0.391186",
  "0.378577", "0.39372", "0.396416", "0.395641", "0.37573",
  "0.379666", "0.377443", "0.391842", "0.402021", "0.377516",
  "0.38936", "0.38936", "0.400883", "0.393171", "0.374419",
  "0.400821", "0.380502", "0.396098", "0.388256", "0.398968",
  "0.392525", "0.401858", "0.387297", "0.376471", "0.378183",
  "0.379787", "0.382024", "0.387928", "0.395367", "0.391972",
  "0.381295", "0.391183", "0.383598", "0.386424", "0.384338",
  "0.401834", "0.406253", "0.392854", "0.399266", "0.400804",
  "0.391146", "0.395441", "0.396265", "0.397894", "0.384822",
  "0.385181", "0.395443", "0.400981", "0.401716", "0.406633",
  "0.406887", "0.40694", "0.391219", "0.387946", "0.398858",
  "0.402233", "0.388583", "0.389772", "0.397084", "0.711566",
  "0.954557", "0.524007", "0.672288", "0.668441", "0.421726",
  "0.549536", "0.932952", "0.397851", "0.395536", "0.354818",
  "0.374355", "0.375257", "0.362613", "0.391271", "0.379219",
  "0.363316", "0.866006", "0.862254", "0.864403", "0.861346",
  "0.845225", "0.784467", "0.801275", "0.638579", "0.847282",
  "0.847402", "0.847747", "0.790411", "0.835979", "0.838546"
]

解决方案

With the release of D3.js v4 d3.layout.histogram has been superseded by d3.histogram() which now belongs to the d3-array module.

To bin your array you create a histogram generator:

var histGenerator = d3.histogram()
  .domain([0,1])    // Set the domain to cover the entire intervall [0,1]
  .thresholds(19);  // number of thresholds; this will create 19+1 bins

There are some more options available to configure your thresholds and thereby your bins, but this generator will do exactly what you asked for. You retrieve the computed bins as an array by calling the generator with your array of values:

var bins = histGenerator(arr);

Have a look at this working example:

var arr = [
  "0.362743", "0.357969", "0.356322", "0.355757", "0.358511",
  "0.357218", "0.356696", "0.354579", "0.828295", "0.391186",
  "0.378577", "0.39372", "0.396416", "0.395641", "0.37573",
  "0.379666", "0.377443", "0.391842", "0.402021", "0.377516",
  "0.38936", "0.38936", "0.400883", "0.393171", "0.374419",
  "0.400821", "0.380502", "0.396098", "0.388256", "0.398968",
  "0.392525", "0.401858", "0.387297", "0.376471", "0.378183",
  "0.379787", "0.382024", "0.387928", "0.395367", "0.391972",
  "0.381295", "0.391183", "0.383598", "0.386424", "0.384338",
  "0.401834", "0.406253", "0.392854", "0.399266", "0.400804",
  "0.391146", "0.395441", "0.396265", "0.397894", "0.384822",
  "0.385181", "0.395443", "0.400981", "0.401716", "0.406633",
  "0.406887", "0.40694", "0.391219", "0.387946", "0.398858",
  "0.402233", "0.388583", "0.389772", "0.397084", "0.711566",
  "0.954557", "0.524007", "0.672288", "0.668441", "0.421726",
  "0.549536", "0.932952", "0.397851", "0.395536", "0.354818",
  "0.374355", "0.375257", "0.362613", "0.391271", "0.379219",
  "0.363316", "0.866006", "0.862254", "0.864403", "0.861346",
  "0.845225", "0.784467", "0.801275", "0.638579", "0.847282",
  "0.847402", "0.847747", "0.790411", "0.835979", "0.838546"
];

var histGenerator = d3.histogram()
  .domain([0,1])    // Set the domain to cover the entire intervall [0;]
  .thresholds(19);  // number of thresholds; this will create 19+1 bins

var bins = histGenerator(arr);
console.log(bins);

<script src="http://d3js.org/d3.v4.js"></script>

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