matlab plotyyy

"plotyyy" 是一个自定义的 MATLAB 函数，它可以在同一张图中绘制三个 Y 轴的曲线。它的使用方法如下：

function [ax,h1,h2,h3]=plotyyy(x1,y1,x2,y2,x3,y3,xlabel,ylabel1,ylabel2,ylabel3,titlestr)
%PLOTYYY - Extends plotyy to include a third y-axis
%
%Syntax:  [AX,H1,H2]=PLOTYYY(X1,Y1,X2,Y2,X3,Y3,XLABEL,YLABEL1,YLABEL2,YLABEL3,TITLESTR)
%
%Inputs: X1,Y1 are the data for the first axes (left)
%        X2,Y2 are the data for the second axes (right)
%        X3,Y3 are the data for the third axes (right)
%        XLABEL is the label for the x-axis
%        YLABEL1 is the label for the left y-axis
%        YLABEL2 is the label for the right y-axis
%        YLABEL3 is the label for the third y-axis
%        TITLESTR is a string containing the title for the plot
%
%Outputs: AX is a vector of three axes handles
%         H1 is the handle for the plot in the first axes
%         H2 is the handle for the plot in the second axes
%         H3 is the handle for the plot in the third axes
%
%Example:
%
% x=0:0.1:10;
% y1=sin(x);
% y2=exp(-0.1*x).*sin(x);
% y3=exp(-0.2*x).*sin(x);
% [ax,h1,h2,h3]=plotyyy(x,y1,x,y2,x,y3,'time (s)','y1','y2','y3','Example plot');
% legend([h1,h2,h3],'y1','y2','y3');
%
%Author: Denis Gilbert, Ph.D., physical oceanography
%Maurice Lamontagne Institute
%Department of Fisheries and Oceans Canada
%email: gilbertd@dfo-mpo.gc.ca  Web: http://www.qc.dfo-mpo.gc.ca/iml/
%January 2000; Last revision: 14-Mar-2000

%modified by Zhanqiao Kang 2022/05/23

其中，x1, y1, x2, y2, x3, y3 分别是三个 Y 轴的数据，xlabel, ylabel1, ylabel2, ylabel3, titlestr 分别是 X 轴标签、左 Y 轴标签、右 Y 轴标签和第三个 Y 轴标签以及图像标题。函数会返回三个轴的句柄以及三个曲线的句柄。