D3.js从数据集中返回错误的值 [英] D3.js scale returning wrong values from dataset

问题描述

我在d3.js中遇到 scales 的问题。当我在Firefox控制台中键入min和max时，我得到的最大值为min，第二个最大值为max。这里有什么问题？

这是我的csv文件形式的数据集：

  word，occur 
 obama，11 
 theguardian，9 
 world，8 
 state，8 
 care，7 
 pakistan，7 
 block，6 
 blog，6 
 healthcare，5 
  

是我在控制台中输入的值，并返回值：

  d3.min（dataset，function（d）{ return d.occur}）; => 11
 d3.max（dataset，function（d）{return d.occur}）; =9
  

d3.max应该返回我11和d3.min应该返回我5

解决方案

您可能没有将您的数据从字符串 code> number 。以下应该给你正确的答案：

  d3.min（dataset，function（d）{return + d.occur} ）; 
 d3.max（dataset，function（d）{return + d.occur}）;但是，你可能想要转换出现 列的数据，直到读取它：
  d3.csv（'myfile'，function（err，dataset） {
 dataset.forEach（function（d）{d.occur = + d.occur;}）; 
 // ... 
}）; 
  
 
I'm having a problem with scales in d3.js. As I type the min and max into the Firefox console, I get the max value as the min and the second-max value as the max. What's the problem here?

Here is my dataset in form of csv file:
word,occur
obama,11
theguardian,9
world, 8
state, 8
care, 7
pakistan,7
block, 6
blog, 6
healthcare, 5
here is what I type into the console and the values I get in return:
    d3.min(dataset, function(d) { return d.occur}); => "11"
    d3.max(dataset, function(d) { return d.occur}); = "9"
the d3.max should return me 11 and d3.min should return me 5
解决方案
You are probably not converting your data from a string to a number. The following should give you the correct answer:
d3.min(dataset, function(d) { return +d.occur}); 
d3.max(dataset, function(d) { return +d.occur});
However, you probably want to convert the occur column of your data to numeric right after reading it:
d3.csv('myfile', function (err, dataset) {     
    dataset.forEach(function (d) { d.occur = +d.occur; });
    // ...
});


                        
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