how to add errorbars
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i want to add errorbars to this graph (the error bar are "std_150,std_100 and std_control" in the code).
thanks
the code:
mw_150=[14.5,19,8.5];
mw_100=[10.42,17.4,17.7];
control=[7.15,41.9,44.3];
std_150=[1.16,1.33,0.9];
std_100=[0.83,1.01,1.09];
std_control=[0.71,1.72,1.77];
bar([1 2 3],[mw_150' mw_100' control'])
legend('150mJ/cm2','100mJ/cm2','control');
set(gca, 'FontSize',12,'XTick',[1 2 3 ],'XTickLabel',{'1.5<A.R<2.5','2.5<A.R<3.5','A.R>3.5' });
ylabel('Relative precentage')
2 个评论
dpb
2014-6-19
Not sure exactly how to envision error "bars" on a bar chart...can you describe what you think it should look like?
Only thoughts come to mind are either use a stacked bar but doesn't really seem like it would work well or use errorbar with the adjust x- coordinates for the bars and no line on the plotted line. I've not tried to see if can convince errorbar to draw the bars but not the trend line directly or whether it would take finding/setting appropriate line handle linestyle property.
aviran
2014-6-19
采纳的回答
Star Strider
2014-6-19
编辑：Star Strider
2014-6-19
EDIT —
If you’d rather have it look like your attached figure, this code will work:
mw_150=[14.5,19,8.5];
mw_100=[10.42,17.4,17.7];
control=[7.15,41.9,44.3];
std_150=[1.16,1.33,0.9];
std_100=[0.83,1.01,1.09];
std_control=[0.71,1.72,1.77];
hb = bar([1 2 3],[mw_150' mw_100' control'])
legend('150mJ/cm2','100mJ/cm2','control');
set(gca, 'FontSize',12,'XTick',[1 2 3 ],'XTickLabel',{'1.5<A.R<2.5','2.5<A.R<3.5','A.R>3.5' });
ylabel('Relative precentage')
errbar = [std_150; std_100; std_control]; % CREATE ‘errbar’ MATRIX
yd = [mw_150' mw_100' control']';
hold on
for k1 = 1:3
errorbar([1:3]+.22*(k1-2), yd(k1,:), errbar(k1,:), '.k', 'LineWidth',2)
end
hold off
11 个评论
aviran
2014-6-19
编辑：Star Strider
2014-6-19
Star Strider
2014-6-19
After some outright experimenting, this works:
mw_150=[58,14.5,19,8.5];
mw_100=[54.5,10.42,17.4,17.7];
control=[6.5,7.15,41.9,44.3];
std_150=[2.34,1.16,1.33,0.9];
std_100=[1.9,0.83,1.01,1.09];
std_control=[0.68,0.71,1.72,1.77];
mw_data = [mw_150; mw_100; control];
hb = bar([1 2 3],mw_data)
legend('150mJ/cm2','100mJ/cm2','control');
set(gca, 'FontSize',12,'XTick',[1 2 3 ],'XTickLabel',{'1.5<A.R<2.5','2.5<A.R<3.5','A.R>3.5' });
ylabel('Relative precentage')
errbar = [std_150; std_100; std_control]; % CREATE ‘errbar’ MATRIX
sclf = 0.18;
mv = mean(1:size(mw_data,2));
% sclv = ([1:size(mw_data,2)]-mv)*sclf+1
hold on
for k1 = 1:size(mw_data,1)
errorbar(([1:4]-mv)*sclf+k1 ,mw_data(k1,:), errbar(k1,:), '.k', 'LineWidth',2)
end
hold off
If you change anything, it should be robust enough to work except for the variable I call ‘sclf’. That scales the matrix to put the errorbars in the middle of the plotted bars, and I have no idea how MATLAB determines where it puts those bars. The handle graphics don’t say, because all the 'XData' values are the same for all variables. I cannot find anything in the documentation that alludes to where they are stored or how they are calculated. So if you change anything else, experiment with ‘sclf’ until it looks decent.
aviran
2014-6-19
Star Strider
2014-6-19
Easily fixed. The caution on ‘sclf’ still holds!
The code:
mw_150=[58,14.5,19,8.5];
mw_100=[54.5,10.42,17.4,17.7];
control=[6.5,7.15,41.9,44.3];
std_150=[2.34,1.16,1.33,0.9];
std_100=[1.9,0.83,1.01,1.09];
std_control=[0.68,0.71,1.72,1.77];
mw_data = [mw_150; mw_100; control]';
hb = bar([1:size(mw_data,1)],mw_data)
legend('150mJ/cm2','100mJ/cm2','control');
set(gca, 'FontSize',12,'XTick',[1:size(mw_data,1)],'XTickLabel',{'A.R<1.5','1.5<A.R<2.5','2.5<A.R<3.5','A.R>3.5' });
ylabel('Relative precentage')
errbar = [std_150; std_100; std_control]'; % CREATE ‘errbar’ MATRIX
sclf = 0.225;
mv = mean(1:size(mw_data,2));
% sclv = ([1:size(mw_data,2)]-mv)*sclf+1
hold on
for k1 = 1:size(mw_data,1)
errorbar(([1:size(mw_data,2)]-mv)*sclf+k1 ,mw_data(k1,:), errbar(k1,:), '.k', 'LineWidth',2)
end
hold off
You had the same three 'XTickLabel' designations, so I assumed they didn’t change, and you were adding another bar to each of them.
Note that ‘sclf’ again changed experimentally. (I still can’t figure out how those bar centres are calculated.)
aviran
2014-6-19
Star Strider
2014-6-19
编辑：Star Strider
2014-6-19
My pleasure!
From what I understand from others who have exported MATLAB graphics to other applications, sometimes they do look strange after exporting them. Another File Exchange contribution, export_fig seems to solve those problems. I’ve not used it often, but I’ve always been impressed with its results.
If you’re exporting the figure for publication, you have to adhere to the journal’s style guide, so be mindful of those requirements. If you’re exporting it for other purposes, your best option is probably as a ‘.png’ file. Nevertheless, I suggest you use export_fig to avoid most — if not all — potential problems for exported MATLAB graphics.
dpb
2014-6-19
Looks pretty much the same in Excel here other than the ylabel is a little funky.
The error bar top/bottom hats are, indeed, pretty miniscule and I don't see any property to let you control how long they are. Star tried to help some by setting the width parameter to make them a little darker but that doesn't do anything for the length of the bounding lines.
Think you're stuck there unless you delve into the code for errorbar itself and figure out where they're drawn or just draw lines yourself--it's really not that much more involved than the machinations already doing.
aviran
2014-6-19
Star Strider
2014-6-19
My pleasure!
(The most sincere expression of appreciation here on MATLAB Answers is to Accept the Answer that most closely solves your problem.)
Yeasir Mohammad Akib
2022-6-6
Hello State Strider,
Can you please expalin the meaning of this line:
for k1 = 1:size(mw_data,1)
errorbar(([1:4]-mv)*sclf+k1 ,mw_data(k1,:), errbar(k1,:), '.k', 'LineWidth',2)
end
The .k portion
Star Strider
2022-6-6
@Yeasir Mohammad Akib — It plots black dots, I believe to avoid connecting the error bars with lines. (This is nearly 8 year-old code. I do not remember what I was thinking back then when I wrote it.)
更多回答（1 个）
...scales the matrix to put the errorbars in the middle of the plotted bars, and I have no idea how MATLAB determines where it puts those bars. The handle graphics don’t say, because all the 'XData' values are the same for all variables. I cannot find anything in the documentation that alludes to where they are stored or how they are calculated...
Got's to go handle-diving Star--they're not identified per se, but you can compute the location by retrieving the XData property from the barseries object patch...
For the sample above for the first handle, one can find
>> xtik=get(get(hb(1),'children'),'xdata')
xtik =
0.6545 1.6545 2.6545
0.6545 1.6545 2.6545
0.8000 1.8000 2.8000
0.8000 1.8000 2.8000
>> mean(xtik(1:2:end,:))
ans =
0.7273 1.7273 2.7273
>>
By comparison, your heuristic values were
>> ([1]-mv)*sclf+[1:3]
ans =
0.7300 1.7300 2.7300
>>
Not bad... :)
2 个评论
Star Strider
2014-6-19
Thank you! I went handle-diving, but apparently not deep enough.
dpb
2014-6-19
No problem...came up with this w/ a poster's help when labeling a bar series w/ values. I'd always used a heuristic based on a the 'Width' parameter before but it wasn't completely reliable, either. This returns the real deal of where actually draws the patch object so is dead on...
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