用多个y轴绘制条形图 [英] make bar plot with multiple y axis

问题描述

我想用条形图表示一些数据:

I have some data I want to represent with a bar graph:

AAA=[2/3 1.5/3 .5/3 3; 1.5/3  1.8/3 .5/3 2.8];
figure
bar([1 2], AAA, 'BarWidth', 1)

但是我想对AAA的每行的前三个条使用一个y轴，对第四条使用不同的y轴.

But I would like to use one y-axis for the first three bars of each line of AAA and a different one for the fourth.

我无法按照建议此处使用plotyy 因为我的条目太多了.

I could't use plotyy as suggested here because I have too many entries.

您知道一些替代方法吗?

Do you know some alternatives?

推荐答案

警告::当您使用不同数量的条形时，此解决方案不容易推广.最终呈现出更好的结果

WARNING: This solution does not generalize easily when you have different numbers of bars... a different method that generalized a bit better is presented at the end

通过阅读文档，我不明白为什么plotyy不起作用(除了在2016a中不赞成使用yyaxis之外).

From reading the docs, I don't see why plotyy wouldn't work (aside from being deprecated in favour of yyaxis in 2016a).

plotyy(X1，Y1，X2，Y2，'function1'，'function2')使用function1(X1，Y1)绘制左轴数据，并使用function2(X2，Y2)绘制右轴数据轴.

plotyy(X1,Y1,X2,Y2,'function1','function2') uses function1(X1,Y1) to plot the data for the left axis and function2(X2,Y2) to plot the data for the right axis.

y1 = [2/3 1.5/3 .5/3; 1.5/3  1.8/3 .5/3];
y2 = [3; 2.8];
x = [1,2];
figure

% based on http://stackoverflow.com/questions/18688381/matlab-bar-plot-grouped-but-in-different-y-scales
offset = (x(2)-x(1))/16; %needs to be generalised, so the 16 should be something like 2^(size(y1,2)+1) or 2^(size(y1,2)+size(y2,2))
width = (x(2)-x(1))/4; %The 4 here also needs to be generalized
colors = {'b','g'};
plotyy(x-offset*5,y1,x+offset*2,y2, @(x,y) bar(x,y,width*4,colors{1}), @(x,y) bar(x,y,width,colors{2}));

但是我想问一下，仅使用subplot

But I would question whether or not it would be clearer to rather just use subplot

如果要更改单个条的颜色(按类别)，则必须手动进行:

If you want to change the colours of the individual bars (per category that is), you have to do it manually:

h = plotyy(x-offset*5,y1,x+offset*2,y2, @(x,y) bar(x,y,width*4,colors{1}), @(x,y) bar(x,y,width,colors{2}));
barGroup1 = h(1).Children;
map1 = [0, 0, 0.4;
        0, 0, 0.6;
        0, 0, 1];
for b = 1:numel(barGroup1)
    barGroup1(b).FaceColor = map1(b,:);
end

另一种方法是不要弄乱offset和width变量，只需在每个y上填充一堆0 s:

Another way to do this is instead of messing around with offset and width variables, just pad each y with a bunch of 0s:

y1 = [2/3 1.5/3 .5/3,1; 1.5/3  1.8/3 .5/3,1;1,1,1,1];
y2 = [3,1; 2.8,1;1,1];
x = [1,2,4]; %x doesn't need to go up in increments of 1 (spacing will differ as you can see in the image), however it can only contain integers
nCol = max(size(y1,2),size(y2,2))*2;
Y1 = zeros(size(y1,1),nCol);
Y2 = zeros(size(y2,1),nCol);
% The idea is the make all the bars from group 1 sit before the group number (i.e. the numbers going from the halfway mark backwards) and all the bars from group 2 sit after the halfway mark (i.e. the numbers from the middle(+1) going forward)
Y1(:,nCol/2-size(y1,2)+1:nCol/2) = y1
Y2(:,nCol/2+1:nCol/2+1+size(y2,2)-1) = y2
h = plotyy(x,Y1,x,Y2, @(x,y) bar(x,y,1,'b'), @(x,y) bar(x,y,1,'g'));

您可以使用与上述相同的方法为图表着色.无论条形数量多少，这都应该概括.不幸的是，您无法控制组之间的间距大小.

You can colour this chart the same way as above. This should generalize no matter the number of bars. Unfortunately you can't control the size of the gap between the groups.

这篇关于用多个y轴绘制条形图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！