Plot bar chart with log scale on y axis

Question

Henrik Hembrock 2019-7-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471962-plot-bar-chart-with-log-scale-on-y-axis

编辑： the cyclist 2019-7-16

Hello there,

I want to plot a group bar chart with differences about 10^-4 within the data, positiv and negativ. So the problem is, either I get a bar chart where just the big values are visible and the small ones disappear, or there is some trouble about plotting negative/postitiv data on a log scale.

I tried to add

set(axes1,'YScale','log')

in my code, but it doesn't work as expected, and i dont know which other options i got.

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Henrik Hembrock 2019-7-16

One of the matrizes:

data1=[-0.000737799000000000	0.0219366000000000	-3.30534000000000  -0.000590114000000000;
-0.00101848000000000	0.0209445000000000	-3.33881000000000	-0.000888108000000000;
-0.000395884000000000	0.0200179000000000	-3.24480000000000	-0.000270600000000000;
-0.00101200000000000	0.0194767000000000	-3.33831000000000	-0.000899477000000000]

An example of my intended output does not exist yet, at least i couldn't find any. But this produces my minimal current output:

fig=figure;
axes1 = axes('Parent',fig);
hold(axes1,'on');
bar1 = bar(data1,'Parent',axes1);
set(bar1(4),'DisplayName','Sphi');
set(bar1(3),'DisplayName','Sz');
set(bar1(2),'DisplayName','Trz');
set(bar1(1),'DisplayName','Sr');
set(fig,'PaperSize',[18 13]);
%set(axes1,'YScale','log')  ---> Ignores negative data

Rik 2019-7-16

Logarithmic scales don't play nice with mixing signs, so it is not entirely clear what you want as an end result. So can you try making an example in something like paint?

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Answer 1

the cyclist 2019-7-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471962-plot-bar-chart-with-log-scale-on-y-axis#answer_383472

编辑：the cyclist 2019-7-16

There are some good thoughts on how to handle this problem in response to this question. In particular, the accepted answer by Matt Tearle seems very useful.

You'll need to adapt to bar chart, but the concept is the same.

Notice that they are doing the log transformation on the X axis, not the Y.