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d3.js で対数グラフを書くときに底を 10 以外にしたい

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d3.js で対数グラフを書きたいときは、d3.scale.log() を使う。このとき対数の底は 10 である。

この底を変更したい場合は 3.1.0 から導入された #base(n) を使う。たとえば、底 2 のグラフを書きたい場合は以下になる。

d3.scale.log().base(2)
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