利用MATLAB绘制双 X 轴曲线

thinkfunny · 发表于 2020-4-8 09:59

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利用MATLAB绘制双 X 轴曲线

该函数调用格式为：

[ax,hl1,hl2] = plotxx(x1,y1,x2,y2,xlabels,ylabels);

参数说明：

ax是坐标轴的句柄。h1 和 h2 是两条曲线的句柄。x1,y1,x2,y2 是绘图数据。Xlabels，Ylabels是X轴和Y州标注内容对应的细胞结构。

例：

D = linspace(-100,0,50);%Y轴数据
S = linspace(34,32,50);%上侧X轴数据
T = 10*exp(D/40);%下侧X轴数据
xlabels{1} = 'Temperature (C)';%下侧X轴内容标注
xlabels{2} = 'Salinity';%上侧X轴内容标注
ylabels{1} = 'Depth(m)';%左侧Y轴内容标注
ylabels{2} = 'Depth(m)';%右侧Y轴内容标注
[ax,hlT,hlS] = plotxx(T,D,S,D,xlabels,ylabels);%绘制双X轴曲线

附件：plotxx.m

function [ax,hl1,hl2] = plotxx(x1,y1,x2,y2,xlabels,ylabels);
%PLOTXX - Create graphs with x axes on both top and bottom
%
%Similar to PLOTYY, but ...
%the independent variable is on the y-axis,
%and both dependent variables are on the x-axis.
%
%Syntax: [ax,hl1,hl2] = plotxx(x1,y1,x2,y2,xlabels,ylabels);
%
%Inputs: X1,Y1 are the data for the first line (black)
%       X2,Y2 are the data for the second line (red)
%       XLABELS is a cell array containing the two x-labels
%       YLABELS is a cell array containing the two y-labels
%
%The optional output handle graphics objects AX,HL1,HL2
%allow the user to easily change the properties of the plot.
%
%Example: Plot temperature T and salinity S
%       as a function of depth D in the ocean
%
%D = linspace(-100,0,50);
%S = linspace(34,32,50);
%T = 10*exp(D/40);
%xlabels{1} = 'Temperature (C)';
%xlabels{2} = 'Salinity';
%ylabels{1} = 'Depth(m)';
%ylabels{2} = 'Depth(m)';
%[ax,hlT,hlS] = plotxx(T,D,S,D,xlabels,ylabels);

%The code is inspired from page 10-26 (Multiaxis axes)
%of the manual USING MATLAB GRAPHICS, version 5.
%
%Tested with Matlab 5.3.1 and above on PCWIN

%Author: Denis Gilbert, Ph.D., physical oceanography
%Maurice Lamontagne Institute, Dept. of Fisheries and Oceans Canada
%email:  Web: http://www.qc.dfo-mpo.gc.ca/iml/
%November 1997; Last revision: 01-Nov-2001

if nargin < 4
error('Not enough input arguments')
elseif nargin==4
%Use empty strings for the xlabels
xlabels{1}=' '; xlabels{2}=' '; ylabels{1}=' '; ylabels{2}=' ';
elseif nargin==5
%Use empty strings for the ylabel
ylabels{1}=' '; ylabels{2}=' ';
elseif nargin > 6
error('Too many input arguments')
end

if length(ylabels) == 1
ylabels{2} = ' ';
end

if ~iscellstr(xlabels)
error('Input xlabels must be a cell array')
elseif ~iscellstr(ylabels)
error('Input ylabels must be a cell array')
end

hl1=line(x1,y1,'Color','k');
ax(1)=gca;
set(ax(1),'Position',[0.12 0.12 0.75 0.70])
set(ax(1),'XColor','k','YColor','k');

ax(2)=axes('Position',get(ax(1),'Position'),...
'XAxisLocation','top',...
'YAxisLocation','right',...
'Color','none',...
'XColor','r','YColor','k');

set(ax,'box','off')

hl2=line(x2,y2,'Color','r','Parent',ax(2));

%label the two x-axes
set(get(ax(1),'xlabel'),'string',xlabels{1})
set(get(ax(2),'xlabel'),'string',xlabels{2})
set(get(ax(1),'ylabel'),'string',ylabels{1})
set(get(ax(2),'ylabel'),'string',ylabels{2})

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

另一种要求：只画一条曲线，但要求标注上下两个x轴的坐标

http://www.ilovematlab.cn/forum.php?mod=viewthread&tid=104483

或者：

x1 = [0:.1:40];
y1 = 4.*cos(x1)./(x1+2);
x2 = [1:.2:20];
y2 = x2.^2./x2.^3;

hl1 = plot(x1,y1,'Color','r');
ax1 = gca;
set(ax1,'XColor','r','YColor','r')

ax2 = axes('Position',get(ax1,'Position'),...
         'XAxisLocation','top',...
         'YAxisLocation','right',...
         'Color','none',...
         'XColor','k','YColor','k');

hl2 = line(x2,y2,'Color','k','Parent',ax2);

ExxNEN · 发表于 2020-4-8 19:16

利用MATLAB绘制双 X 轴曲线

sunygd · 发表于 2020-4-9 18:43

研究研究。

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利用MATLAB绘制双 X 轴曲线

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