Plot bar chart with log scale on y axis

2019 7 16
1 个回答
更新时间：2019 7 16
38 次查看（30 天）

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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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Rik
Rik 2019-7-16
A logarithmic scale doesn't work well when you need to cross the 0. Can you give a small example of your data and the intended output?
It may be the best solution to stick two axes together, one with the positive data and one for the negative.
Henrik Hembrock
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
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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回答（1 个）

the cyclist
the cyclist 2019-7-16
编辑：the cyclist 2019-7-16

0 个投票

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.

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