MATLAB: Use annotation function changing the string dinathecally

annotation dynamic text

Hi,
I want to create a text in a figure but outside the axis, but it has to change with the time according to some pressure sensors. I am using "annotation" function:
loop:
steps=steps+1;
txt = ['Steps number: ' num2str(step_number) ' units'];  
annotation('textbox',[.9 .5 .1 .2],'String',txt,'EdgeColor','none');
The issue is that the value it's being overlapped each iteration. Could someone help please? Thanks

Best Answer

Create the annotation once, and then only change the string property inside the loop.
figure(1)
txt='';
h_annot=annotation('textbox',[.9 .5 .1 .2],'String',txt,'EdgeColor','none');
for steps=1:5
    step_number=steps;
    txt = sprintf('Steps number: %d units',step_number);
    set(h_annot,'String',txt)
    drawnow%force graphics update, pause(0.001) will work as well
    for k=1:1e6
        1+1;%have some calculation to simulate your actual processing time
    end
end
close(1)
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