What is wrong with this ax.Xlim code?

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

[Rik]

Please copy the entire error stack. My first guess would be that your Matlab version does not support this syntax. In that case you may try:

set(ax,'XLim',datenum([tim - seconds(15) tim]))

[Jerry Abdul]

hey Rik.

This is what the error stack says:

Invalid or deleted object.

Error in Temp_Plot (line 45) ax.XLim = datenum([tim - seconds(15) tim]);

[Rik]

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.

[Adam]

ax.YGrid = 'on';
ax.YLim = [25 55];

both apparently worked fine so I doubt set syntax will change anything.

You ought to be able to see if the axes has been deleted though. Certainly with a breakpoint in the code.