Error bars on grouped bar plot

Question

Johnathan Viernik 2017-1-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/319525-error-bars-on-grouped-bar-plot

评论： Kien Nguyen 2019-12-20

Hi, I would like to place error bars for the following grouped bar plot. I tired different solution on the web but couldn't find the one that worked... Any help would be appreciated! Thanks

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Kien Nguyen 2019-12-20

Hi Jahnathan,

I am trying to plot bar chart like your image, but I do not know how to read the bar values and error values from the excel file. For example:

1 1.1 1.3 1.5 1.8 0.2 0.23 0.4 0.3

2 1.5 1.2 1.6 2.0 0.22 0.27 0.34 0.2

3 1.4 1.9 1.0 1.5 0.26 0.18 0.2 0.25

Here x = column 1 (1, 2, 3)

y = columns 2, 3, 4 (1.1 1.3 1.5 1.8

1.5 1.2 1.6 2.0

1.4 1.9 1.0 1.5

and error bars = columns 5,6,7

Do you know how to read these data to plot bar chart?

Thanks,

Kevin

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2017-1-8

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/319525-error-bars-on-grouped-bar-plot#answer_249799

在 MATLAB Online 中打开

You didn’t say what you tried or what version of MATLAB you’re running.

This will work for R2014b and later:

a=[0,1,0,0;
4,3,2,1;
2,2,1,3;
1,0,0,0];
b=[0,1,0,0;
1,2,1,1;
1,1,1,2;
1,0,0,0];
ctrs = 1:4;
data = a;
figure(1)
hBar = bar(ctrs, data);
for k1 = 1:size(a,1)
    ctr(k1,:) = bsxfun(@plus, hBar(1).XData, [hBar(k1).XOffset]');
    ydt(k1,:) = hBar(k1).YData;
end
hold on
errorbar(ctr, ydt, b, '.r')
hold off

Here, ‘a’ are the bars, and ‘b’ are the error bars.

A different approach is necessary for R2014a and earlier:

figure(1)
hBar = bar(xval,data);                     % Plot Data, Get Handle
set(hBar(1), 'FaceColor', cmap(2,:))       % Colour First Bar Set
set(hBar(2), 'FaceColor', cmap(3,:))       % Colour First Bar Set
set(gca, 'YLim', [870 1080])               % Set Y-Axis Limits
hold on
for k1 = 1:length(hBar)                    % Loop: Plots Error Bars
    hb = get(get(hBar(k1),'Children'), 'XData');
    midbar = mean(hb);
    errorbar(midbar, data(:,k1), errs(:,k1), '.') % plotting errors
    sigbarx(k1,:) = midbar;                % Use To Plot Significance Bars
end

I can no longer run the R2014a code, so you will have to experiment with the concepts with your data.

In both code examples, the errorbar plotting occurs in the for loop.

6 个评论
显示 4更早的评论隐藏 4更早的评论

Florian Perdreau 2017-9-29

在 MATLAB Online 中打开

Thank you for this answer and for the generalized example. This last example unfortunately won't work if you call "hold on" prior to calling bar(). For some reasons, x coordinates of individual bars get rounded in this case. Does anyone have an idea of why it would be the case? Here is the code to reproduce this behaviour:

nGroup = 5; % Number of group
nStack = 3; % Number of bars/group
% Generate some random data
se = rand(nStack, nGroup); % standard error
data = randn(nStack, nGroup); % averages
%%Working example  ("hold on" after calling bar())
figure;
% Plot individual bars
hBar = bar(data');
% Get x and y position of bars
ctr = zeros(nStack, nGroup);
ydt = zeros(nStack, nGroup);
for i = 1:length(hBar)
  ctr(i,:) = bsxfun(@plus, hBar(1).XData, [hBar(i).XOffset]');
  ydt(i,:) = hBar(i).YData;
end
disp(ctr); % Prints x positions (double numbers)
hold on;
% Plot error bars on top of individual bar plots
errorbar(ctr', ydt', se', 'o', 'marker', 'none', 'linewidth', 2);
hold off;
%%Not Working example ("hold on" before calling bar())
figure; % Create figure
hold on;
hBar = bar(data');
ctr = zeros(nStack, nGroup);
ydt = zeros(nStack, nGroup);
for i = 1:length(hBar)
  ctr(i,:) = bsxfun(@plus, hBar(1).XData, [hBar(i).XOffset]');
  ydt(i,:) = hBar(i).YData;
end 
disp(ctr); % Prints x positions (rounded numbers)
% Plot error bars on top of individual bar plots
errorbar(ctr', ydt', se', 'o', 'marker', 'none', 'linewidth', 2);
hold off;

Frederik Dalby 2018-3-13

编辑：Frederik Dalby 2018-3-13

Hi, I have tried out the script, which works great when the x-axis is numeric. However i cant get it to work when i want a categorical x-axis. It gives me an error from the bsxfun: "Error using bsxfun Operands must be numeric arrays."

My script looks like Star Strider's except ctrs= categorical(["hey", "what", "is", "this","kind"]);

do you have any suggestions to make it work? I hope you can help

Caleb Begly 2019-3-14

在 MATLAB Online 中打开

Categorical variables for the group names make this not work. I tried a variety of different things to get them to work and finally found that the easiest way is to just let it use numbers for the groups, and then just override them using XTickLabel. So in your case:

set(gca, 'XTickLabel', {'hey','what','is','this','kind'})

请先登录，再进行评论。

Answer 2

Mary Rezaee 2019-7-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/319525-error-bars-on-grouped-bar-plot#answer_384093

Hi everyone. Thanks for your helpful answers. I tried your code ‘Star Strider’, but I ran into a problem. “XOffset” doesn’t exist! While reaching that line of the code, I get an error which says no appropriate method, property of field “XOffset” for class ‘matlab.graphics.chart.primitive.Bar’ I am using Matlab R2017. Any help would be really appreciated.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Kien Nguyen 2019-12-20

Hi,

Anyone can help me. I am a beginner.

I want to plot bar chart like Johnathan's image, but I do not know how to read the bar values and error values from the excel file. For example:

1 1.1 1.3 1.5 1.8 0.2 0.23 0.4 0.3

2 1.5 1.2 1.6 2.0 0.22 0.27 0.34 0.2

3 1.4 1.9 1.0 1.5 0.26 0.18 0.2 0.25

Here x = column 1 (1, 2, 3)

y = columns 2, 3, 4 (1.1 1.3 1.5 1.8

1.5 1.2 1.6 2.0

1.4 1.9 1.0 1.5

and error bars = columns 5,6,7

Do you know how to read these data to plot bar chart?

Thanks,

Kevin

请先登录，再进行评论。

Error bars on grouped bar plot

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

采纳的回答

6 个评论
显示 4更早的评论隐藏 4更早的评论

更多回答（1 个）

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

另请参阅

类别

标签

Community Treasure Hunt

Error bars on grouped bar plot

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

采纳的回答

6 个评论 显示 4更早的评论隐藏 4更早的评论

更多回答（1 个）

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

另请参阅

类别

标签

Community Treasure Hunt

WeChat

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

6 个评论
显示 4更早的评论隐藏 4更早的评论

1 个评论
显示 -1更早的评论隐藏 -1更早的评论