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三轴坐标图
1 函数
MATLAB绘制三轴图函数可见MATLAB帮助-multiplotyyy
基础图形绘制是很简单，但坐标轴及字体设置该如何实现呢？
本文以以下几个例子为例，希望可以解决在利用MATLAB绘制三轴坐标图时常见的疑惑。
2 案例
2.1 案例1：绘图及基础设置
根据给定案例，添加坐标轴及字体设置，成图如下：
MATLAB相关代码如下：
clc
close all
clear
%% 导入数据
pathFigure= '.\Figures\' ;
figureUnits = 'centimeters';
figureWidth = 25;
figureHeight = 15;x1 = (0:0.01:1)';
x2 = (0:0.1:1)';
x3 = (0:0.05:1)';
y1 = x1;
y2 = x2.^2;
y3 = x3.^3;
y4 = sin(x1);
y5 = fliplr(2*x1.^2);
y6 = 7*cos(x1);
y7 = 7*log(x1+1.2);%% 开始绘图ylabels{1}='First y-label';
ylabels{2}='Second y-label';
ylabels{3}='Third y-label';
[ax,hlines] = multiplotyyy({x1,y1,x2,y2,x3,y3,x1,y4},{x1,y5},{x1,[y6,y7]},ylabels);
set(gcf, 'Units', figureUnits, 'Position', [0 0 figureWidth figureHeight]);
set(hlines{1}(:),'LineStyle','-','Marker','o','MarkerFaceColor','b','Markersize',3);
set(hlines{2}(:),'LineStyle','--','Marker','o','MarkerFaceColor','g','Markersize',3);
set(hlines{3}(:),'LineStyle','none','Marker','o','MarkerFaceColor','r','Markersize',3);
xlabel(ax(1),"X",'FontName','Times New Roman','FontSize',12);
ylabel(ax(1),"Y1",'FontName','Times New Roman','FontSize',12);
ylabel(ax(2),"Y2",'FontName','Times New Roman','FontSize',12);
ylabel(ax(3),"Y3",'FontName','Times New Roman','FontSize',12);
set(ax(1),'xlim',[0 1],'xtick',0:0.1:1,'xticklabel', 0:0.1:1 ,'FontSize',12,'FontName','Times New Roman');
set(ax(1),'ylim',[0 1],'ytick',0:0.1:1,'yticklabel',0:0.1:1,'FontSize',12,'FontName','Times New Roman');
set(ax(2),'ylim',[0 2],'ytick',0:0.2:2,'yticklabel',0:0.2:2,'FontSize',12,'FontName','Times New Roman');
set(ax(3),'ylim',[0 7],'ytick',0:1:7,'yticklabel',0:1:7,'FontSize',12,'FontName','Times New Roman');
hl = legend(cat(1,hlines{:}),'a','b','c','d','e','f','g','location','w');
set(hl,'Box','off','location','NorthWest','NumColumns',2,'FontSize',12,'FontName','Times New Roman');
set(gca,'FontSize',12,'Fontname', 'Times New Roman');str= strcat(pathFigure, "Fig.1", '.tiff');
print(gcf, '-dtiff', '-r600', str);
2.2 案例2：更改坐标轴颜色
此外，可根据需要更改坐标轴颜色，成图如下：
MATLAB相关代码如下：
clc
close all
clear
%% 导入数据
pathFigure= '.\Figures\' ;
load('Streamflow.mat');
ylabels{1}='干旱历时/月';
ylabels{2}='干旱烈度';
ylabels{3}='干旱强度';
x1 = 1:nYear;
mycolor = [0 0 0;77,133,189;237,119,69;80 80 80]/255;figureUnits = 'centimeters';
figureWidth = 25;
figureHeight = 15;% 站点1：安宁渡
% ---------------------------------------------------------------------------------
[ax,hlines] = multiplotyyy({x1,droughtCharacter{1,1}(:,3)},{x1,droughtCharacter{1,1}(:,4)},{x1,droughtCharacter{1,1}(:,5)},ylabels);
set(gcf, 'Units', figureUnits, 'Position', [0 0 figureWidth figureHeight]);
set(hlines{1}(:),'LineStyle','-','linewidth',1.5,'color',mycolor(4,:),'Marker','o','MarkerFaceColor',mycolor(4,:),'Markersize',3);
set(hlines{2}(:),'LineStyle','--','linewidth',1.5,'color',mycolor(2,:),'Marker','^','MarkerFaceColor',mycolor(2,:),'Markersize',3);
set(hlines{3}(:),'LineStyle','none','linewidth',1.5,'color',mycolor(3,:),'Marker','.','MarkerFaceColor',mycolor(3,:),'Markersize',12);
set(ax(1),'xlim',[0 nYear+1],'xtick',1:5:nYear+1,'xticklabel', yearStart:5:yearEnd ,'FontSize',12,'FontName','Times New Roman','XColor',mycolor(1,:));
set(ax(1),'ylim',[0 33],'YAxisLocation','left','ytick',0:6:33,'yticklabel',0:6:33,'FontSize',12,'FontName','Times New Roman','YColor',mycolor(1,:));
set(ax(2),'ylim',[0 36],'ytick',0:5:36,'yticklabel',0:5:36,'FontSize',12,'FontName','Times New Roman','YColor',mycolor(2,:));
set(ax(3),'ylim',[0 1.8],'ytick',0:0.3:1.8,'yticklabel',0:0.3:1.8,'FontSize',12,'FontName','Times New Roman','YColor',mycolor(3,:));
xlabel(ax(1),"年份",'FontName','宋体','FontSize',12);
ylabel(ax(1),ylabels{1},'FontName','宋体','FontSize',12,'Fontweight','bold');
ylabel(ax(2),ylabels{2},'FontName','宋体','FontSize',12,'Fontweight','bold');
ylabel(ax(3),ylabels{3},'FontName','宋体','FontSize',12,'Fontweight','bold'); str= strcat(pathFigure, "Fig. ", '.tiff');
print(gcf, '-dtiff', '-r600', str);
根据此案例可以发现，当坐标轴1和坐标轴2刻度不一致时，图1右侧刻度会与坐标轴2刻度同时出现，那么，此问题应该如何解决呢？
2.3 案例3：解决坐标轴1和2刻度不一致问题
成图如下：
对比案例2，修改代码如下：
[ax,hlines] = multiplotyyy({x1,droughtCharacter{1,1}(:,3)},{x1,droughtCharacter{1,1}(:,4)},{x1,droughtCharacter{1,1}(:,5)},ylabels);
set(gcf, 'Units', figureUnits, 'Position', [0 0 figureWidth figureHeight]);
set(hlines{3}(:),'LineStyle','none','linewidth',1.5,'color',mycolor(3,:),'Marker','.','MarkerFaceColor',mycolor(3,:),'Markersize',14);
set(hlines{1}(:),'LineStyle','-','linewidth',1.5,'color',mycolor(4,:));%,'Marker','o','MarkerFaceColor',mycolor(4,:),'Markersize',3);
set(hlines{2}(:),'LineStyle',':','linewidth',1.5,'color',mycolor(2,:));%,'Marker','^','MarkerFaceColor',mycolor(2,:),'Markersize',3);
set(ax(1),'xlim',[0 nYear+1],'xtick',1:5:nYear+1,'xticklabel', yearStart:5:yearEnd ,'FontSize',12,'FontName','Times New Roman','XColor',mycolor(1,:));
set(ax(1),'ylim',[0 33],'YAxisLocation','left','ytick',0:6:33,'yticklabel',0:6:33,'FontSize',12,'FontName','Times New Roman','YColor',mycolor(1,:),'LineWidth',0.5,'box', 'off');
ax1 = axes('Position',get(ax(1),'Position'),...'XAxisLocation','top',...'YAxisLocation','left',...'Color','none',...'YColor','k');
set(ax1,'XTick', [],'YTick', []);
set(ax(2),'ylim',[0 36],'ytick',0:5:36,'yticklabel',0:5:36,'FontSize',12,'FontName','Times New Roman','YColor',mycolor(2,:),'LineWidth',1);
set(ax(3),'ylim',[0 1.8],'ytick',0:0.3:1.8,'yticklabel',0:0.3:1.8,'FontSize',12,'FontName','Times New Roman','YColor',mycolor(3,:),'LineWidth',1);
xlabel(ax(1),"年份",'FontName','宋体','FontSize',14);
ylabel(ax(1),ylabels{1},'FontName','宋体','FontSize',14,'Fontweight','bold');
ylabel(ax(2),ylabels{2},'FontName','宋体','FontSize',14,'Fontweight','bold');
ylabel(ax(3),ylabels{3},'FontName','宋体','FontSize',14,'Fontweight','bold'); str= strcat(pathFigure, "Fig. 站点1：安宁渡", '.tiff');
print(gcf, '-dtiff', '-r600', str);
2.4 案例4：设置右侧俩坐标轴间距
根据案例3，发现右侧两坐标轴间距过大，通过修改原函数代码可调整其间距，成图如下所示：
具体修改multiplotyyy函数，代码修改参数如下：
% Set the axes position and size
pos = [0.1 0.1 0.8 0.8];
offset = pos(3)/10;
pos(3) = pos(3) - offset/2;
ax(1).Position = pos;
ax(2).Position = pos;
参考
1.MATLAB帮助-multiplotyyy
引用格式：
Laura Proctor (2023). multiplotyyy (https://www.mathworks.com/matlabcentral/fileexchange/39595-multiplotyyy), MATLAB Central File Exchange.