Javascript 在 D3 中读取没有标题行的 csv/tsv
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read csv/tsv with no header line in D3
提问by by0
I have CSV data which looks something like:
我有 CSV 数据，看起来像：
Data
数据
1,1,10
1,2,50
1,3,5
etc...
And I am trying to read in the data. However, my initial data does not contain a header row (as seen above) so it is taking the first data row to be the header (1,1,10). Is there anyway around this. I want to set the header names after I read the data
我正在尝试读取数据。但是，我的初始数据不包含标题行（如上所示），因此将第一个数据行作为标题 (1,1,10)。有没有办法解决。我想在读取数据后设置标题名称
Javascript
Javascript
d3.csv("data/testnh.csv", function(data) {
console.log(data);
}
Thanks!
谢谢！
回答by mbostock
Use d3.textto load the data, and then d3.csvParseRowsto parse it. For example:
使用d3.text加载数据，然后使用d3.csvParseRows解析它。例如：
d3.text("data/testnh.csv", function(text) {
console.log(d3.csvParseRows(text));
});
You'll probably also want to convert your columns to numbers, because they'll be strings by default. Assume they are allnumbers, you could say:
您可能还想将列转换为数字，因为默认情况下它们将是字符串。假设他们是所有的数字，你可以说：
d3.text("data/testnh.csv", function(text) {
var data = d3.csvParseRows(text).map(function(row) {
return row.map(function(value) {
return +value;
});
});
console.log(data);
});
回答by egnha
Since Bostock's answer in 2012, d3.csv.parseRowsallows for an optional accessor function, which enables his answer to be expressed more concisely:
自 2012 年 Bostock 的回答以来，d3.csv.parseRows允许一个可选的访问器函数，这使得他的回答能够更简洁地表达：
d3.text("data/testnh.csv", function(text) {
var data = d3.csv.parseRows(text, function(d) {
return d.map(Number);
});
// Now do something with data
});
回答by Zhe Hu
first read in data using d3.text, then add custom header string, then parse the result with d3.csv.parse
首先使用 读入数据d3.text，然后添加自定义标头字符串，然后使用d3.csv.parse
d3.text("data/testnh.csv", function(r){
var result = "x, y, z\n" + r; //now you have the header
var data = d3.csv.parse(result);
//do your plotting with data
}
回答by Bimal Grg
Try d3.csvParse(text)
试试d3.csvParse(text)
d3.csv.parseRows seems doesn't work in modern d3 version.
d3.csv.parseRows 似乎在现代 d3 版本中不起作用。
