Is there no log base 2?

[LDubya]

Is there any way to use a log base 2 scale? Currently the log scale is implemented in base 10.

If this is not currently a feature, then if you can show us where in the code to edit, we might try to implement a "log2" type ourselves and submit a pull request.

There is a similar discussion, #2362, but that discussion is far bigger in scope, requesting fully customizable log bases. We just need a log base 2, which is quite standard.

[LDubya]

So I've answered my own question. We can use dtick to accomplish this in combination with "type" set to "log".

With a "type" set to "log", dtick takes a number such that ticks are set every 10^(n"dtick) .

So dtick allows us to use the change of base formula to change the base.

A base 2 axis can be constructed with a type set to "log" and a dtick set to log10(2), or 0.30102999566.

A base 5 axis can be constructed with a type set to "log" and a dtick set to log10(5), or 0.69897000433.

etc.

So this should also work for #2362.