How to add percent change in barplot?

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Daphne PARLIARI
Daphne PARLIARI 2021-1-4
评论： Daphne PARLIARI 2021-1-4
Hello everyone and happy new year!
I have a barplot (average deaths per degree of temperature, 30-37oC) to which I want to add the percentage change from bar to bar. Attached you can find the excel file I am proccessing and here is the part of code that produces tha barplot.
Is there an efficient way to do so?
Thanks in advance!
PS. I am on R2019a.
Daily_Data = readtable('Daily_Data_MoT.xlsx');
idx = Daily_Data.Daily_T(:) > 30;
Daily_Data_new = Daily_Data(idx,:);
[G, Temperature] = discretize(Daily_Data_new.Daily_T, 30:37);
d_mean = accumarray(G, Daily_Data_new.Daily_Deaths, [length(Temperature), 1], @mean);
bar(Temperature, d_mean); xlabel('T (oC)'); ylabel('Average deaths');

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采纳的回答

Steve Eddins
Steve Eddins 2021-1-4
编辑：Steve Eddins 2021-1-4
If you want text labels instead of a line plot (Cris' suggestion), then try this code. It gets the Bar object as the output argument from bar, and then computes the percent change and where to put the labels using the XData and YData properties of the Bar object.
b = bar(Temperature, d_mean); xlabel('T (oC)'); ylabel('Average deaths');
x = b.XData;
y = b.YData;
percent_change = 100 * diff(y) ./ y(1:end-1);
for k = 1:length(percent_change)
text(x(k+1),y(k+1),sprintf('%0.1f%%',percent_change(k)),...
'HorizontalAlignment','center',...
'VerticalAlignment','bottom')
end
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Steve Eddins
Steve Eddins 2021-1-4
reference_temp = y(1); % 30oC in plot
percent_change = 100 * (y - reference_temp) / reference_temp;
Daphne PARLIARI
Daphne PARLIARI 2021-1-4
With this code below
x = b.XData;
y = b.YData;
reference_temp = y(1); % 30oC in plot
percent_change = 100 * (y - reference_temp) / reference_temp;
for k = 1:length(percent_change)
text(x(k+1),y(k+1),sprintf('%0.1f%%',percent_change(k)),...
'HorizontalAlignment','center',...
'VerticalAlignment','bottom')
end
I am getting the Error: Index exceeds the number of array elements (8).

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更多回答（1 个）

Cris LaPierre
Cris LaPierre 2021-1-4
You can add a line plot to a bar plot. Just use the hold on command.
If you need it to be on a separate Y scale, look at this example
  1 个评论
Daphne PARLIARI
Daphne PARLIARI 2021-1-4
Thank you Cris! Since I am not very experienced in MatLab, Steve's answer was easier for me to comprehend...

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