CODEWITHSUNDEEP
d3.js
CDavis
CDavis

Reputation: 105

setting the y.domain with a function in d3.js

I am trying to set the max of the y.domain in a boxplot in d3.js to the 90% quantile of all the data.

My code is at http://bl.ocks.org/cgdnorth/7218544.

I would like to change y.domain([min,max]); to have the max equal to the 90th of all the data rather than the maximum point.

Thanks for your help.

Upvotes: 0

Views: 431

Answers (2)

Scott Cameron
Scott Cameron

Reputation: 5323

D3 has a d3.quantile function that takes a sorted array of numbers and a quantile specifier and returns the value from the array that corresponds to that quantile. So in your case you'd use:

var ninetieth = d3.quantile(numbers, 0.9);

Upvotes: 2

Lars Kotthoff
Lars Kotthoff

Reputation: 109242

You can get this by sorting the array of all values and then indexing into it, something like

var values = [];
data.forEach(function(d) { values = values.concat(e); });
values.sort(d3.ascending);
var max = values[Math.round((values.length-1)*0.9)];

Upvotes: 0

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