這建立在

Jens Boldsen’s answer之上,它添加了以下內容：

>可以旋轉表示圖例中錯誤欄的線條使其垂直,或保持默認的水平方向;

>該行的末尾用短線“關閉”.

該方法非常通用,因為它支持：

>任意顏色,線型和標記作為錯誤欄的參數.請注意,實際條形圖始終繪制為實線,沒有標記(使用指定的顏色).這是根據errorbar行為.

>新創建的短線隨圖例移動.

>這些線的寬度是可配置的參數.此外,errobar的長度是垂直情況下的參數.兩者都以相對于圖例的標準化單位定義.

根據Matlab版本,該方法略有不同,因為R2014b中引入的圖形對象發生了變化.此外,圖例中的errobar線可以是水平的或垂直的.

所以有四種情況.

案例I：Pre-R2014b,圖例中的水平誤差條

繪制數據和圖例后,代碼將遵循以下步驟：

>獲得傳奇的孩子們

>在這些孩子中找到合適的路線

>獲取其x和y坐標

>利用這些坐標,在每一端創建兩條短線.將這些線條作為傳奇的子項,以便它們隨之移動.

該代碼已在Matlab R2010b中測試過.

%// Define graph aspect

color_spec = 'r'; %// color of data and bars.

linestyle_spec = '--'; %// linestyle for data. The bars are always solid

marker_spec = 'o'; %// marker for data

wid = .12; %// width of bar in legend. Normalized units

%// Plot errobar

h_er = errorbar([1 2], [2 3], [0.1 0.2], [color_spec linestyle_spec marker_spec]);

%// Add dummy line for legend (as per Jens Boldsen) and create legend

hold on;

plot(0,0,color_spec); %// linestyle is always solid with no marker

h_le = legend('Mean','Standard deviation','Location','north');

%// Add short lines at each end of line in the legend

c_le = get(h_le, 'Children'); %// step 1

h_li = findobj(c_le, 'linestyle','-', 'color',color_spec, 'marker','none'); %// step 2

h_li = h_li(1); %// in case there's more than one

li_x = get(h_li,'XData'); %// step 3

li_y = get(h_li,'YData');

line(li_x([1 1]), li_y+wid*[-.5 .5], 'parent',h_le, 'color',color_spec); %// step 4

line(li_x([2 2]), li_y+wid*[-.5 .5], 'parent',h_le, 'color',color_spec);

案例II：R2014b,圖例中的水平誤差條

在Matlab R2014b中,圖例不再是軸對象,也沒有子對象.因此,必須針對案例I修改步驟1和2：

>創建圖例時獲取圖例的圖標

>在這些圖標中查找相應的行

>獲取其x和y坐標

>利用這些坐標,在每一端創建兩條短線.使這些線與初始線共享父線,以便它們與圖例一起移動.

此外,此Matlab版本中的新語法有助于簡化代碼.

%// Define graph aspect

color_spec = 'r'; %// color of data and bars.

linestyle_spec = '--'; %// linestyle for data. The bars are always solid

marker_spec = 'o'; %// marker for data

wid = .12; %// width of bar in legend. Normalized units

%// Plot errobar

h_er = errorbar([1 2], [2 3], [0.1 0.2], [color_spec linestyle_spec marker_spec]);

%// Add dummy line for legend (as per Jens Boldsen)

hold on;

plot(0,0,color_spec); %// linestyle is always solid with no marker

%// Create legend and add short lines at each end of line in the legend

[~, icons] = legend('Mean','Standard deviation','Location','north'); %// 1

li = findobj(icons, 'type','line', 'linestyle','-'); %// 2

li = li(1); %// in case there's more than one

li_x = li.XData; %// 3

li_y = li.YData;

line(li_x([1 1]), li_y+wid*[-.5 .5], 'parent',li.Parent, 'color',color_spec); %// 4

line(li_x([2 2]), li_y+wid*[-.5 .5], 'parent',li.Parent, 'color',color_spec);

案例III：Pre-R2014b,圖例中的垂直錯誤欄

這與情況I類似,但需要擺弄線條的x和y坐標.此外,引入了一個新參數來控制圖例中錯誤欄的長度.

%// Define graph aspect

color_spec = 'r'; %// color of data and bars.

linestyle_spec = '--'; %// linestyle for data. The bars are always solid

marker_spec = 'o'; %// marker for data

wid = .04; %// width of bar in legend. Normalized units

len = .45; %// length of main bar in legend. Normalized units

%// Plot errobar

h_er = errorbar([1 2], [2 3], [0.1 0.2], [color_spec linestyle_spec marker_spec]);

%// Add dummy line for legend (as per Jens Boldsen) and create legend

hold on;

plot(0,0,color_spec); %// linestyle is always solid with no marker

h_le = legend('Mean','Standard deviation','Location','north');

%// Add short lines at each end of line in the legend

c_le = get(h_le, 'Children');

h_li = findobj(c_le, 'linestyle','-', 'color',color_spec, 'marker','none');

h_li = h_li(1); %// in case there's more than one

set(h_li,'XData', repmat(mean(get(h_li,'XData')),1,2));

set(h_li,'YData', mean(get(h_li,'YData'))+len*[-.5 .5]);

li_x = get(h_li,'XData');

li_y = get(h_li,'YData');

line(li_x+wid*[-.5 .5], li_y([1 1]), 'parent',h_le, 'color',color_spec);

line(li_x+wid*[-.5 .5], li_y([2 2]), 'parent',h_le, 'color',color_spec);

案例IV：R2014b,圖例中的垂直錯誤欄

同樣,這與案例II類似,但有一些擺弄線的坐標.

%// Define graph aspect

color_spec = 'r'; %// color of data and bars.

linestyle_spec = '--'; %// linestyle for data. The bars are always solid

marker_spec = 'o'; %// marker for data

wid = .05; %// width of small bars in legend. Normalized units

len = .45; %// length of main bar in legend. Normalized units

%// Plot errobar

h_er = errorbar([1 2], [2 3], [0.1 0.2], [color_spec linestyle_spec marker_spec]);

%// Add dummy line for legend (as per Jens Boldsen)

hold on;

plot(0,0,color_spec); %// linestyle is always solid with no marker

%// Create legend, modify line and add short lines

[~, icons] = legend('Mean','Standard deviation','Location','north');

li = findobj(icons, 'type','line', 'linestyle','-');

li = li(1); %// in case there's more than one

li.XData = repmat(mean(li.XData),1,2);

li.YData = mean(li.YData)+len*[-.5 .5];

li_x = li.XData;

li_y = li.YData;

line(li_x+wid*[-.5 .5], li_y([1 1]), 'parent',li.Parent, 'color',color_spec);

line(li_x+wid*[-.5 .5], li_y([2 2]), 'parent',li.Parent, 'color',color_spec);

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