How to plot error bars

조회 수: 4 (최근 30일)
Marcel
Marcel 2011년 8월 26일
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.
  댓글 수: 2
Oleg Komarov
Oleg Komarov 2011년 8월 26일
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
Marcel 2011년 8월 28일
I'd like to have the error bars(std error) on the middle of the stair.

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채택된 답변

Oleg Komarov
Oleg Komarov 2011년 8월 28일
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{:})
  댓글 수: 2
Marcel
Marcel 2011년 8월 29일
Thanks very much for your help, really appreciate it.
How would that be with min and max error?
Marcel
Marcel 2011년 8월 30일
Thank you Oleg. Great stuff.

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추가 답변 (2개)

Arturo Moncada-Torres
Arturo Moncada-Torres 2011년 8월 26일
I would recommend you to take a look at the following FEX submissions:
  댓글 수: 2
Sean de Wolski
Sean de Wolski 2011년 8월 26일
"healthy error bars" :)
Do healthy error bars finish their vegetables? Is TMW feeding their error bars too much candy?
Arturo Moncada-Torres
Arturo Moncada-Torres 2011년 8월 26일
LOL, good one =)

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ASMS Mat Su
ASMS Mat Su 2012년 11월 29일
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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