如何解決matlab中這個boxplot的圖例？

Question

這個boxplot的傳說來自相同的顏色！我怎樣才能解決這個問題？如何將x軸標籤移動一點點？感謝您的幫助。

close all 
clc;clear; 
f=figure; 
Temp_O=[-0.234115422389688;-0.153751688636750;3.03158128172032;-0.746185319551222;0.491616009046725;1.17490826218458;0.495331079652895;0.757394580248284;1.28467417069223;0.710444835069366;-0.979521722186138;-0.216850422633648;0.0596632891728577;-0.525362330358090;0.681608181821661;-0.995216710339821;-0.706416688978551;-0.147700048468633;-0.145946504735073;0.355209739265580;1.25860455564176;0.970569089382961;3.99404165520844;0.433235373567272;1.37023527554759;1.45032207715449;2.00968917969203;0.840884198707613;2.08558564237223;2.05435556980046;-15.5517060656394;3.18991806590028;1.28277879106186;2.15931490153483;3.19647581545030;2.97877640768595;0.0857405478541730;-1.59362648933500;-2.18109410889313;0.751077088333943;0.795072796032814;4.18896005388773;-0.591461781602054;-0.229818549439720]; 
position_O = 5:5:25; 
position_O=position_O'; 
g = [ones(10,1); 2*ones(10,1); 3*ones(10,1) ;4*ones(10,1);5*ones(4,1)]; 
box_O = boxplot(Temp_O,g,'colors','b','positions',position_O,'width',0.8); 
h=findobj(gca,'tag','Outliers'); 
delete(h) 
    set(gca,'XTickLabel',{' '}) 
hold on 
Temp_S=[-0.234069549668875;-0.0803021151079149;0.166729084507040;-0.991371043478263;0.320651878289472;0.118699258741257;-0.190944834558825;0.540367970198674;1.02556298920863;0.112849364285713;-0.395341229166667;0.382362326388889;-1.40591456976744;0.247202120000001;-1.33262568333333;-1.27793610544218;0.0400995141843974;-1.32333150653595;-1.84221947163121;0.407607340136054;0.264276120300749;-0.337747273809525;1.03841878571429;-1.41048786507936;0.901727821428570;-1.03012908482143;2.69786876785714;-0.691010535714286;1.66913088345865;0.684260974489794;-10.3923539047619;1.04994314285714;2.13557031632653;3.87736348701299;7.38705700000000;0.0451628482142860;-3.69094742857143;-1.14071104081633;-3.15830153968254;-4.41399970408163;6.09908001655629;0.0267684861111112;-2.67854298170732;0.925146217948717;]; 
position_S = 6.8:5:26.8; 
position_S=position_S'; 
box_S = boxplot(Temp_S,g,'colors','r','positions',position_S,'width',0.8); 
h=findobj(gca,'tag','Outliers'); 
delete(h) 
legend(findobj(gca,'Tag','Box'),'Group1','Group2') 
set(gca,'XTickLabel',{' '}) ; 
hold off 
text('Position',[5,-11],'String','S') 
text('Position',[10,-11],'String','M') 
text('Position',[15,-11],'String','L') 
text('Position',[20,-11],'String','V') 
text('Position',[25,-11],'String','C') 

xlabel('Types','FontSize',10); 
% set(get(gca, 'XLabel'), 'Position', [0 .2 0]); % 
ylim([-10.5 7.8]); 

Answer 1

問題是，你只顯示前兩個盒子的圖例（你的盒子總共有10個盒子），而且這兩個盒子都是紅色的。前5個盒子是紅色的，最後5個盒子是藍色的。相反，您可以使用第一個和最後一個框。

%// Create the box plot 
box_S = boxplot(Temp_S, g, 'colors', 'r', 'positions', position_S, 'width', 0.8); 

%// Get all of the box plot objects 
boxes = findobj(gca, 'Tag', 'Box'); 
legend(boxes([end 1]), 'Group1', 'Group2') 

你可以用下面這樣做更有力，但：

boxes = findobj(gca, 'Tag', 'box'); 

%// Sort by xposition 
[~, ind] = sort(cellfun(@mean, get(boxes, 'XData'))); 

%// Apply legends to one red and one blue one. 
legend(boxes(ind(1:2)), 'Group1', 'Group2'); 

並移動xlabel低一點，你可以簡單地調整它的Position財產。

yrange = diff(get(gca, 'YLim')); 
XL = get(gca, 'XLabel'); 
original = get(XL, 'Position'); 

%// Add an extra 1% padding 
set(XL, 'Position', original - [0 0.01*yrange 0]) 

Answer 2

這裏是一個小例子（我只保留必要的東西）：

x1 = randn(44,1); 
x2 = randn(44,1); 
pos1 = (5:5:25)'; 
pos2 = (6.8:5:26.8)'; 
g = repelem([1 2 3 4 5], [10 10 10 10 4]); 

h1 = boxplot(x1, g, 'Colors','b', 'Positions',pos1, 'Width',0.8); 
hold on 
h2 = boxplot(x2, g, 'Colors','r', 'Positions',pos2, 'Width',0.8); 
hold off 
legend([h1(5,1),h2(5,1)], {'Group1','Group2'}) 

引述help boxplot：

% H = BOXPLOT(...) returns the handle H to the lines in the box plot. 
% H has one column per box, consisting of the handles for the various 
% parts of the box. For the traditional plotstyle, the rows correspond 
% to: upper whisker, lower whisker, upper adjacent value, lower adjacent 
% value, box, median, and outliers. For the compact plotstyle, the rows 
% correspond to: whiskers, box, median outer, median inner, and outliers. 
% If median comparison intervals are indicated with markers, H will have 
% two more rows for notch lo and notch hi. If medianstyle or boxstyle 
% have been set explicitly, the meaning of the rows will adjust 
% accordingly.