How to plot error bars
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Hello,
Having this type of data....
time1 = [0.14 0.99 1.67 2.45 3.10 3.70 4.24 5.00]
res1 = [4 6 2 9 1 0 4 7]
time2 = [0.11 0.69 1.00 1.45 1.66 2.04 2.24 2.99 3.11 3.43 4.25
4.55 5.00]
res2 = [8 1 5 3 7 1 3 10 9 5 3 2 1]
time3 = [0.09 0.33 1.13 1.44 2.10 2.70 3.24 4.00 4.80 5.00]
res3 = [0 3 4 7 2 6 3 4 9 8]
and a solution (given by Oleg Komarov) to average it....
--------------------------------------------------------
% unique time vector
untime = 0:0.5:5;
% Idx
[trash,idx1] = histc(untime,[0 time1(1:end-1) inf]);
[trash,idx2] = histc(untime,[0 time2(1:end-1) inf]);
[trash,idx3] = histc(untime,[0 time3(1:end-1) inf]);
rep = [res1(idx1); res2(idx2); res3(idx3)];
avg = mean(rep);
hold on
% Plot all the lines
stairs(untime,rep.')
% Plot the average in black
stairs([0 untime], [9 avg],'Color','k','Linew',2)
------------------------------------------------------------------
I'd like to know how to plot error bars in this case. I was trying to use function given in matlab but the vectors dimensions don't match.
Thanks for help.
2 个评论
Oleg Komarov
2011-8-26
Where do you want your error bars, on the middle of the stair or when the stair shifts, i.e. every 0:0.5:5? What kind of error you want? max and min, std error, absolute deviation?
Marcel
2011-8-28
采纳的回答
Oleg Komarov
2011-8-28
Add this line at the end:
opt = {'k','Linew',2,'LineS','none'};
x = 0.25:0.5:4.75;
y = avg(1:end-1);
errorbar(x,y,std(rep(:,1:end-1)),opt{:})
EDIT with min and max
L = y - min(rep(:,1:end-1));
U = max(rep(:,1:end-1)) - y;
errorbar(x,y,L,U,opt{:})
更多回答（2 个）
Arturo Moncada-Torres
2011-8-26
1 个投票
I would recommend you to take a look at the following FEX submissions:
2 个评论
Sean de Wolski
2011-8-26
"healthy error bars" :)
Do healthy error bars finish their vegetables? Is TMW feeding their error bars too much candy?
Arturo Moncada-Torres
2011-8-26
LOL, good one =)
ASMS Mat Su
2012-11-29
I have almost similar problem... but this time the value of L and U is on different size. I want it to be L= min and U= max value instead of std error which is only one value (+ or - value).
I tried to create a bar graphs with errorbars(min and min) instead of std error.
Any one know how to solve this?
This is my code and what I tried.
mean = [1 2 3; 4 5 NaN; 7 8 9]; min = [-0.0040 -0.0281 -0.0252; -0.0154 -0.0076 -0.0282; -0.0137 -0.0297 -0.0526]; max = [0.0470 0.0166 0.0015; 0.0015 -0.0038 0.0216; -0.0000 0.0091 0.0316 ];
figure bar(mean); colormap summer grid on hold on
x = 1:3;
y = mean;
L = min;
U = max;
errorbar(x,y,L,U);
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