I have bar with log scale:
BarLegend[{(Blend[{{Log10@1, White}, {Log10@10, Cyan}, {Log10@100,
Blue}}, Log10@#] &), {1, 100}}, Ticks -> {1, 10, 100}]
with result
.
How to get log-scale on the bar?
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2 Answers
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The difficulty here is that there are two different spaces you are working in and you have to know where each is being used. Specifically, we want the ticks in $\log_{10}$ space, but the labels in linear space. So, we have to specify the labels, too, to make it work correctly, e.g.
logTicks[min_, max_] := {#, 10^#} & /@ FindDivisions[{min, max}, 5]
Unfortunately, Ticks does not accept a function in BarLegend, otherwise I would do this
BarLegend[{"Rainbow", {0, 5}}, Ticks -> logTicks]
Instead, the range needs to be specified
BarLegend[{"Rainbow", {0, 5}}, Ticks -> logTicks[0,5]]
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1$\begingroup$ I am using Mathematica 12. Doing what you do, ticks appear reads in my code (but the code is working). Why so ? $\endgroup$– StarBucKSep 30, 2020 at 15:24
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2$\begingroup$ @StarBucK if you run
Options@BarLegend, you'll noticeTicksis not in the list. The FE at some point (can't remember exactly when) started marking unknown options red, even if they fell into a hidden list. So, treat the red as just a warning. $\endgroup$– rcollyerSep 30, 2020 at 17:08
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BarLegend[
{
{White, Cyan, Blue},
{0, Power[10, 6]}
}
, Power[10, Range[0, 5]]
]
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$\begingroup$ Thank but how to get smooth blend, with 1=White, 10=Cyan and 100= Blue? $\endgroup$– Nigel1May 29, 2018 at 11:54
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