animatedline fails after the first iteration

Question

Youstina E 2020-8-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/576253-animatedline-fails-after-the-first-iteration

评论： Walter Roberson 2020-8-7

Hi,

It was previously working but now I am getting an empty plot in the second subplot after the first iteration. Code is as follows:

for i=1:10:length(tu)
  ax1=  subplot(2,1,1)
  pcolor(lontemp(findnearest(150,lontemp):findnearest(160, lontemp)),lattemp, hc')
  Y1=get(gca,'ylim');
  set(ax1,'dataaspectratio',[.7 cos((Y1(2)+Y1(1))/5/180*pi) 1], 'position',[0.204,0.5,0.55,0.42])
  ax2=subplot(2,1,2)
  if i==1
    curve1=animatedline;
    curve2=animatedline;
    curve3=animatedline;
    curve2.Color='blue';
    curve3.Color='red';
    set(ax2,'Xlim',[1 365],'Ylim', [min(T1) max(T1)], 'Position',[0.13,0.11,0.775,0.29], 'plotboxaspectratio',[1,0.31,0.31])
    grid on
    addpoints(curve1,m(i),n(i));
    hold on
    addpoints(curve2,m(i),T1(i));
    addpoints(curve3,m(i),T2(i));
    drawnow;
    pause(0.1)
  else
    grid on
    addpoints(curve1,m(i),n(i));  
    addpoints(curve2,m(i),T1(i));
    addpoints(curve3,m(i),T2(i));
    drawnow;
    pause(.1);
  end
end

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Youstina E 2020-8-6

just to clarify, the addpoints code works fine in the loop as long as it's not in a subplot.

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Answer 1

Walter Roberson 2020-8-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/576253-animatedline-fails-after-the-first-iteration#answer_476236

Create the subplot and modify their position before the loop. Make sure to pass the axes to the hold() and grid() calls.

At present you keep calling subplot and then modify the position. However each time you call subplot it figures out where the plot belongs based on the n m index parameters, and if it finds any axes that over overlap those coordinates but not exactly the same coordinates then it deletes the old one. So subplot() all your axes into existence first before you set the position of any of them, and record the axes handles and do not subplot in a loop unless you do not mind old axes potentially being deleted.

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dpb 2020-8-7

pcolor as above would be totally immaterial to subplot(2,1,2)

Does not the above generate the expected lines?

Walter Roberson 2020-8-7

hAx1 = subplot(2,1,1);
hAx2 = subplot(2,1,2);
pcolor(hAx1, lontemp(findnearest(150,lontemp):findnearest(160, lontemp)),lattemp, squeeze(hc(:,:,i))');
Y1 = ylims;
%postpone setting the Position of the subplots until all subplots are created
set(hAx1, 'dataaspectratio', [.7 cos((Y1(2)+Y1(1))/5/180*pi) 1], 'position', [0.204,0.5,0.55,0.42])
set(hAx2, 'Xlim', [1 365], 'Ylim', [min(T1) max(T1)], 'Position', [0.13,0.11,0.775,0.29], 'plotboxaspectratio', [1,0.31,0.31])
grid(hAx2, 'on')
hold(hAx2, 'on')
curve1 = animatedline(hAx2);
curve2 = animatedline(hAx2,'color','blue');
curve3 = animatedline(hAx2,'color','red');
for i = 1:10:length(tu)
  addpoints(curve1,m(i),n(i));
  addpoints(curve2,m(i),T1(i));
  addpoints(curve3,m(i),T2(i));
  drawnow;
  pause(0.1)
end