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Control errorbar width in Matlab R2014b

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Sandor Toth
Sandor Toth on 11 Dec 2014
Commented: Brandon Madsen on 25 Jan 2018
Pre R2014b Matlab versions allowed the separate control of the length of the top and bottom error bar lines separately through the 'xdata' property. This is not possible any more in Matlab R2014b, where the 'xdata' property contains only the x coordinates of the data points but not the error bar lines. Is there a way to control the error bar line length in Matlab R2014b?
  8 Comments
Brandon  Madsen
Brandon Madsen on 25 Jan 2018
See 1/25/2018 answer here ( https://www.mathworks.com/matlabcentral/answers/100333-how-do-i-change-the-width-of-the-horizontal-lines-at-top-and-bottom-of-error-bars-in-my-errorbar-plo ) for a version that I think should work for 2014b (it works for 2015b for sure). It involves hacking into the darkest depths of Matlab, as suspected ;)

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Answers (3)

Sean de Wolski
Sean de Wolski on 7 Jan 2015
Pre-R2014b, this was possible because the errorbar series had children which were lines you could adjust. Since that's no longer the case, this approach no longer works.
I'd at least recommend contacting tech-support with your use-case and reasoning so that they can add an enhancement request for it.
  5 Comments
Scott Webster
Scott Webster on 14 Mar 2017
I received a response from MathWorks. A CapSize property has been added to the errorbars as of R2016b. Here is my previous example updated to use this functionality (with excessive crossbar width):
x=[5 25];
y=[10 10];
err=[5 5];
hold on
h=errorbar(x,y,err,'ro');
h.CapSize = 12;
x=[13 17];
h=errorbar(x,y,err,'bo');
h.CapSize = 12;
print('-dpng','errorbars3.png');
The resultant plot is as follows.
However, I also noticed that the errorbar width was actually ok for this example in R2016b before I even adjusted the capsize, so it seems that some other general improvements were made as well.
Finally, MathWorks also provided the following code example for manually drawing the crossbars in case you don't have R2016b.
% Create errorbar
X = 0:pi/10:pi;
Y = sin(X) + 1;
E = std(Y) * ones(size(X));
ha = errorbar(X, Y, E);
% Width of the top and bottom lines of errorbar
xlength = 0.1;
% Make horizontal lines with 'line'
for k = 1:length(X)
x = [X(k) - xlength, X(k) + xlength];
y_h = [Y(k) + E(k), Y(k) + E(k)];
line(x, y_h);
y_b = [Y(k) - E(k), Y(k) - E(k)];
line(x, y_b);
end

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Ramaprasad Kulkarni
Ramaprasad Kulkarni on 20 Dec 2016
You guys might have found a solution, but just putting this out there:
An alternate and easier option to control the width of the top/bottom crossbars is to plot each pair of [x(i), y(i)] points and corresponding errorbar(x(i),y(i),err(i)). This ensures the width of the top/bottom crossbars is 0.02*x(i).
The downside of this approach is you have to use an unnecessary for loop to go over all the values in the X/Y vectors.
  1 Comment
Scott Webster
Scott Webster on 3 Mar 2017
Wouldn't that result in inconsistent crossbar widths though, if they were scaled with the x position value?

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