I have data in list b3, First step is normalizing the histogram using the following command, Histogram[b3, 100, "ProbabilityDensity"]

Second I would like to make the y scale log, I use

Histogram[b3, 1000, "ProbabilityDensity", "LogCount"]

But this is not working.


1 Answer 1

b3 = RandomVariate[NormalDistribution[0, 1], 1000];

Use the form {"Log", hspec} in the third argument of Histogram to get log transformed heights (see Histogram >> Details and Options):

Histogram[b3, 100, {"Log", "PDF"}]

enter image description here

Alternatively, use the option ScalingFunctions:

Histogram[b3, 100, "PDF", ScalingFunctions -> {None, "Log"}]

enter image description here

Note: Height specification "ProbabilityDensity" (afaik) is not documented and it gives the same height list as "PDF":

HistogramList[b3, 100, "PDF"][[2]] == 
 HistogramList[b3, 100, "ProbabilityDensity"][[2]]
HistogramList[b3, 100, {"Log", "PDF"}][[2]] == 
 HistogramList[b3, 100, {"Log", "ProbabilityDensity"}][[2]]
  • $\begingroup$ Thank a lot, it is very helpful. $\endgroup$ Nov 11, 2020 at 5:10
  • $\begingroup$ @SachinKaushik, my pleasure. Thank you for the accept. $\endgroup$
    – kglr
    Nov 11, 2020 at 5:33
  • $\begingroup$ If i further want to divide y axis by 2 then how can i include it. Question is i have data, first step is obtaining normalized histogram which you showed and then divide the y axis of histogram by 2, keeping everything else same. $\endgroup$ Nov 25, 2020 at 3:25
  • $\begingroup$ @SachinKaushik, you can use something like: hl = HistogramList[b3, 100, "PDF"]; Histogram[b3, {hl[[1]]}, hl[[2]]/2 &, ScalingFunctions -> {None, "Log"}] $\endgroup$
    – kglr
    Nov 25, 2020 at 3:57

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