d3JS带有顺序标度的直方图 [英] d3JS Histogram with ordinal scale
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问题描述
我想要得到一个D3JS直方图，使用一个顺序量表（在这种情况下，学生成绩符号（A +，A，B ... F）。
I am trying to get a D3JS histogram working with an ordinal scale (in this case, student grade symbols (A+, A, B ... F).
以下是最低工作示例：
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var studentSymbols = ["F", "E", "D", "C", "C", "C", "C", "B", "B", "A", "A+"];
var x = d3.scale.ordinal()
.domain(["F", "E", "D", "C", "B", "A", "A+"])
.rangeRoundBands([0, width]);
// Generate a histogram using twenty uniformly-spaced bins.
var myHistogram = d3.layout.histogram()
(studentSymbols);
console.log(myHistogram)
</script>
</body>
当上面的代码运行时，控制台输出一个5个数组的数组，
When the above is run, the console outputs an Array of 5 Arrays, with dx and x fields equal to NaN.
推荐答案
我想我可能想出来了。我将myHistogram的声明改为：
I think I may have figured it out. I changed the declaration of myHistogram to:
var myHistogram = d3.layout.histogram()
(studentSymbols.map(x));
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