Matlab plotyy coordinate axis setting, [reprint] example of MATLAB plotyy drawing double ordinate graph [easy to understand]

Hello everyone , I meet you again , I'm your friend, Quan Jun .

Matlab plotyy Example of drawing double ordinate diagram

x = 0:0.01:20;

y1 = 200*exp(-0.05*x).*sin(x);

y2 = 0.8*exp(-0.5*x).*sin(10*x);

[AX,H1,H2] = plotyy(x,y1,x,y2,’plot’);

set(AX(1),’XColor’,’k’,’YColor’,’b’);

set(AX(2),’XColor’,’k’,’YColor’,’r’);

HH1=get(AX(1),’Ylabel’);

set(HH1,’String’,’Left Y-axis’);

set(HH1,’color’,’b’);

HH2=get(AX(2),’Ylabel’);

set(HH2,’String’,’Right Y-axis’);

set(HH2,’color’,’r’);

set(H1,’LineStyle’,’-‘);

set(H1,’color’,’b’);

set(H2,’LineStyle’,’:’);

set(H2,’color’,’r’);

legend([H1,H2],{‘y1 = 200*exp(-0.05*x).*sin(x)’;’y2 =

0.8*exp(-0.5*x).*sin(10*x)’});

xlabel(‘Zero to 20 musec.’);

title(‘Labeling plotyy’);

Q： It's circled in blue on the right tick Can you remove it ？ Because of the use of plotyy drawing , In order to make the diagram as clear as possible , It was used set(AX(1),’YLimMode’,’auto’), But this may lead to the left AX(1) And on the right AX(2) Of tick The spacing of the is different , Affect beauty . Or can you make plotyy On both sides of the picture tick The spacing is the same , So on the right side of the graph tick Will coincide .

A： If you just want plotyy The picture is more beautiful , It can be called in the following form ：

[AX,H1,H2] = plotyy(…)

among AX(2) It's on the right Axes Object handle , After you get it, you can set perhaps get To deal with the , It can also be ytick Turn off the .

A： It can also be used. line Sentence to draw , There is no line on the left and top .

Q：plotyy(X1,Y1,X2,Y2,FUN1,FUN2),FUN1 and FUN2 How to write ？

A： these two items. FUN representative plotyy You don't have to use two plot, Take the following example , A curve uses plot, One for semilogy

x1=1:0.1:100;

x2=x1;

y1=x1;

y2=x2.^3;

plotyy(x1,y1,x2,y2,@plot,@semilogy)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

MATLAB Draw Double ordinates

A graph with two ordinate scales

stay MATLAB in , If you need to draw two figures with different ordinate scales , have access to plotyy Plot function . The invocation format is ：

plotyy(x1,y1,x2,y2)

among x1,y1 Corresponding to a curve ,x2,y2 Corresponding to another curve . The scale of the abscissa is the same , The ordinate has two , The left ordinate is used for x1,y1 Data on , The right ordinate is used for x2,y2 Data on .

double y Axis coordinates can be expressed as plotyy(x,y1,x,y2) To achieve

double x Coordinates can be used

set(gca,’xaxislocation’,’bottom’,’xticklabel’,{‘0′,’1′,’2′,’3′,’4’})

( hypothesis x The axis is marked as 1,2,3,4)

set(gca,’xaxislocation’,’top’,’xticklabel’,{‘0′,’1′,’2′,’3′,’4’})

Make the corresponding settings

【 * example 10.7.3 -1 】 A two coordinate system is made to represent the transition process of high pressure and low temperature .

tp=(0:100)/100*5;yp=8+4*(1-exp(-0.8*tp).*cos(3*tp)); % Pressure data

tt=(0:500)/500*40;yt=120+40*(1-exp(-0.05*tt).*cos(tt)); %

Temperature data

% Generate a two coordinate system graph

clf reset,h_ap=axes(‘Position’,[0.13,0.13,0.7,0.75]);

%<4>

set(h_ap,’Xcolor’,’b’,’Ycolor’,’b’,’Xlim’,[0,5],’Ylim’,[0,15]);

nx=10;ny=6; %<6>

pxtick=0:((5-0)/nx):5;pytick=0:((15-0)/ny):15;

%<7>

set(h_ap,’Xtick’,pxtick,’Ytick’,pytick,’Xgrid’,’on’,’Ygrid’,’on’)

h_linet=line(tp,yp,’Color’,’b’);

%<9>

set(get(h_ap,’Xlabel’),’String’,’ Time /rightarrow ( branch ) ‘)

set(get(h_ap,’Ylabel’),’String’,’ pressure /rightarrow(/times10 ^{5}

Pa )’)

h_at=axes(‘Position’,get(h_ap,’Position’));

%<12>

set(h_at,’Color’,’none’,’Xcolor’,’r’,’Ycolor’,’r’);

%<13>

set(h_at,’Xaxislocation’,’top’)

%<14>

set(h_at,’Yaxislocation’,’right’,’Ydir’,’rev’)

%<15>

set(get(h_at,’Xlabel’),’String’,’/fontsize{15}/fontname{ Official script } Time

/rightarrow ( branch ) ‘)

set(get(h_at,’Ylabel’),’String’,’ ( {/circ}C )/fontsize{15}

/leftarrow /fontname{ Official script } Subzero temperature ‘)

set(h_at,’Ylim’,[0,210]) %<18>

line(tt,yt,’Color’,’r’,’Parent’,h_at)

%<19>

xpm=get(h_at,’Xlim’); %<20>

txtick=xpm(1):((xpm(2)-xpm(1))/nx):xpm(2);

%<21>

tytick=0:((210-0)/ny):210;

%<22>

set(h_at,’Xtick’,txtick,’Ytick’,tytick)

%<23>

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

example ( Verified )：

clc;

clear all;

close all;

x=0:0.1:2*pi;

y1=sin(x);

y2=cos(x);

[AX]=plotyy(x,y1,x,y2);

set(get(gca,’xlabel’),’string’,’X-axis’);

set(get(AX(1),’Ylabel’),’string’,’left Y-axis’);

set(get(AX(2),’Ylabel’),’string’,’right Y-axis’);

set(gca,’xTick’,[0:0.5:7]);

set(AX(1),’yTick’,[-1:0.2:1]);

set(AX(2),’yTick’,[-1:0.5:1]);

There are still problems ： This setting method , The minimum scale unit of each axis can be set , But the scale range (x take (0～7),y1 take (-1～1)) Cannot set .

2010-12-23 modify

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

clc

clear all

close all

runoff=[10700 11400 15800 22900 43100 40700 50500 46000 41800

35000];

sed=[0.105 0.094 0.156 1.264 0.363 0.429 0.731 0.682 0.654 0.290];

m=1:10;

[ax,h1,h2]=plotyy(m,runoff,m,sed); %h– line handle

set(get(ax(1),’Ylabel’),’string’,’Runoff (m^3/s))’,’color’,’r’)

%y1

set(get(ax(2),’Ylabel’),’string’,’Sediment concentration

(kg/m^3)’,’color’,’k’) %y2

xlabel(‘Month’)

set(h1,’linestyle’,’-‘,’color’,’r’); set(h2,’linestyle’,’- -‘,’color’,’k’);

legend([h1 h2],’runoff’,’sediment concentration’) % Mark two lines

legend(‘boxoff’)

% box off

set(ax(:),’Ycolor’,’k’) % Set two Y The color of the shaft is black

set(ax(1),’ytick’,[0:10000:100000]); % Set up y Axial spacing

set(ax(2),’ytick’,[0:0.1:1.5])

set(ax,’xlim’,[1 12]) % Set up x Axis range

hold on

scatter(ax(1),4,22900,’r*’)

axes(ax(2));

hold on

scatter(4,1.264,’ro’)

2011 year 4 month 22 New day

Publisher ： Full stack programmer stack length , Reprint please indicate the source ：https://javaforall.cn/150679.html Link to the original text ：https://javaforall.cn