这建立在

Jens Boldsen’s answer之上,它添加了以下内容：

>可以旋转表示图例中错误栏的线条使其垂直,或保持默认的水平方向;

>该行的末尾用短线“关闭”.

该方法非常通用,因为它支持：

>任意颜色,线型和标记作为错误栏的参数.请注意,实际条形图始终绘制为实线,没有标记(使用指定的颜色).这是根据errorbar行为.

>新创建的短线随图例移动.

>这些线的宽度是可配置的参数.此外,errobar的长度是垂直情况下的参数.两者都以相对于图例的标准化单位定义.

根据Matlab版本,该方法略有不同,因为R2014b中引入的图形对象发生了变化.此外,图例中的errobar线可以是水平的或垂直的.

所以有四种情况.

案例I：Pre-R2014b,图例中的水平误差条

绘制数据和图例后,代码将遵循以下步骤：

>获得传奇的孩子们

>在这些孩子中找到合适的路线

>获取其x和y坐标

>利用这些坐标,在每一端创建两条短线.将这些线条作为传奇的子项,以便它们随之移动.

该代码已在Matlab R2010b中测试过.

%// 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,图例中的水平误差条

在Matlab R2014b中,图例不再是轴对象,也没有子对象.因此,必须针对案例I修改步骤1和2：

>创建图例时获取图例的图标

>在这些图标中查找相应的行

>获取其x和y坐标

>利用这些坐标,在每一端创建两条短线.使这些线与初始线共享父线,以便它们与图例一起移动.

此外,此Matlab版本中的新语法有助于简化代码.

%// 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,图例中的垂直错误栏

这与情况I类似,但需要摆弄线条的x和y坐标.此外,引入了一个新参数来控制图例中错误栏的长度.

%// 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,图例中的垂直错误栏

同样,这与案例II类似,但有一些摆弄线的坐标.

%// 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);