Using hold and plotyy in a loop

Question

Jonathan 2015-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/233790-using-hold-and-plotyy-in-a-loop

评论： Jonathan 2015-8-14

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I am having trouble getting matlab to update plotyy in a loop.

I want extend a line of data as my code advance in time.

This is easily done for a single plot, as shown below for a simplified extract of my code

for year=1:1:year_max
  %***Do Calcs
  CalcStuff(year)
    %***plot
    figure(1)
    subplot(3,1,[2 3]);  cla;  hold on;
     %some stuff
    subplot(311); hold on; 
    plot(year/1000,sum(State.Ice),'k.');
     xlabel('Time (kyrs BP)')
     ylabel ('Total Ice Mass')
    drawnow;
 end;

However, the similar code below for two lines using plotyy() is broken. The first Data point appears and STAYS on the plot (great), but all subsequent data are overwritten each loop (BAD!!).

for year=1:1:year_max
  %***Do Calcs
  CalcStuff(year)
    %***plot
    figure(1)
    subplot(3,1,[2 3]);  cla;  hold on;
     %some stuff
    subplot(311); hold on; 
     [ax,h1,h2]=plotyy(year/1000,sum(State.Ice),year/1000,CO2ppmv);
     set(h1, 'linestyle', '.','color','k'); set(ax(1), 'ycolor', 'k')
     set(h2, 'linestyle', '.','color','r'); set(ax(2), 'ycolor', 'r')
     hold(ax(1));hold(ax(2));
     xlabel('Time (kyrs BP)')
     ylabel ('Total Ice Mass')
    drawnow;
 end;