What is wrong with this ax.Xlim code?

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Jerry Abdul 2017-3-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/329811-what-is-wrong-with-this-ax-xlim-code

评论： Adam 2017-3-14

So basically, I downloaded a code from this website. Im trying to obtain a live data plot from a LM35 temperature sensor. I keep getting an error saying that my ax.xlim line has an error. I have not been able to find out what the error was. Please help. TIA

if true
  a = arduino;
  v = readVoltage(a,'A1');
  temp = v*100;
  ii = 0;
  temp = zeros(1e4,1);
  t = zeros(1e4,1);
  tic
  while toc < 10
      ii = ii+1;
      v = readVoltage(a,'A1');
      temp(ii) = v*100;
      t(ii) = toc;
  end
    temp = temp(1:ii);
    t = t(1:ii);
    figure
    plot(t,temp,'-o')
    xlabel('Elapsed time (sec)')
    ylabel('Temperature (\circC)')
    title('Temperature Data')
    set(gca,'xlim',[t(1) t(ii)])
    figure
    h = animatedline; 
    ax = gca;
    ax.YGrid = 'on';
    ax.YLim = [25 55];
    stop = false;
    startTime = datetime('now');
    while ~stop
        v = readVoltage(a,'A1');
        temp = v*100;
        tim =  datetime('now') - startTime;
        addpoints(h,datenum(tim),temp)
        * _ax.XLim = datenum([tim - seconds(15) tim]);_*
        datetick('x','keeplimits')
        drawnow
        stop = readDigitalPin(a,'D12');
    end
end

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Rik 2017-3-14

I am guessing that tim will still exist, which would mean that you ax somehow got deleted. I bet you did not close the figure, so my ideas are done here.

My advice would be to try out the set() just in case and go through your code step by step with the debugger. That should help you spot when variables change to values that they should not be.