# I am plotting the moving median of the result of a for loop, but it is plotting multiple lines?

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Mark Lepage on 27 Jun 2017
Answered: Mark Lepage on 27 Jun 2017
My code goes something like this
hold on
For i = 1:end;
result(i)= calc;
median = movmedian(result,10);
plot(i,median);
end
As the median is calculated, multiple lines are being plotted, proportional to the moving median range I'm using... any ideas?

Mark Lepage on 27 Jun 2017
Figured it out,
Just needed to plot the value of median i.e.
plot(i,median(i),'or')

Geoff Hayes on 27 Jun 2017
Mark - you have hold on which will retain the current plot when adding new ones. And since you call plot on each iteration of your for loop, then you will see all lines. If you wish to only show the latest value, then you can either remove the hold on or you can change the x and y data for the first drawn plot graphics object. For example,
figure;
ylim([0 255]);
xlim([1 5]);
hold on;
hPlot = plot(NaN,NaN);
for i = 1:5
set(hPlot, 'XData',i, 'YData', randi(255,1,1), 'LineStyle', 'o');
pause(1.0);
end
So we create one plot graphics object and use it's handle to change/set the x and y data on each iteration of the loop
Note that your for loop iterates from 1:end. Is this intentional or a typo?