Errorbar on bar graph using table values

3 次查看（过去 30 天）
Katherine Regalado Rosales
回答： Shubham Khatri 2020-9-3
How can I add an error bar using table values to my bar graph?
Relevant code:
clear
close all
format shortG
T=readtable('experiment1.xlsx');
T.subject=double(T.subject);
T.video=double(T.video);
T.estimates=double(T.estimates);
T.verbs=cellstr(T.verbs);
T(1:5,:)
[v,verbs] = findgroups(T.verbs);
[meanEstimates]=splitapply(@mean,T.estimates,v);
meanEstimates=round(meanEstimates,1);
table1=table(verbs,meanEstimates);
table1=renamevars(table1,"meanEstimates","Mean speed estimate");
table1=renamevars(table1,"verbs","Verb");
table1=sortrows(table1,"Mean speed estimate","descend");
figure
hold on
b1=bar(categorical(table1{1:5, 1}), table1{1:5, 2});
xlabel("Verb");
ylabel("Mean speed estimate");
title(["SPEED ESTIMATES FOR THE VERBS"; "USED IN EXPERIMENT 1"]);
errorbar(x,y,err) % im not sure what to write for the inputs
  1 个评论
Katherine Regalado Rosales
Katherine Regalado Rosales 2020-9-1
so far whats worked is
errorbar(categorical(table1{1:5, 1}), table1{1:5, 2}),'.');
but I'm supposed to make the size the std of mean Estimates

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回答（1 个）

Shubham Khatri
Shubham Khatri 2020-9-3
To my understanding, currently the size of the error bar would be the value of the data in ‘Mean speed estimate ‘ column of the table. To make the size equal to the standard deviation of the values, you need to calculate the standard deviation. After calculating the standard deviation, you need to scale it to the size of the data you want to plot. Please have a look at the code section below
figure
hold on
b1=bar(categorical(table1{1:5, 1}), table1{1:5, 2})
temp=std(meanEstimates); % Defining a temperory variable 'temp' having value of standard deviation of the meanEstimates
err=ones(size(table1{1:5,2}))*temp; % Scaling the variable 'temp' to the size of data in table (here 5x1)
errorbar(table1{1:5,2},err) % Plotting the error bars
xlabel("Verb");
ylabel("Mean speed estimate");
title(["SPEED ESTIMATES FOR THE VERBS"; "USED IN EXPERIMENT 1"]);
hold off
For more information on errorbar, click the link below
https://www.mathworks.com/help/matlab/ref/errorbar.html

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