How to draw a verical line to x-axis in a graph?

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M G
M G 2011-11-2
Hey all,
If a = [1 2 3 4 5 6 7]; and b = [1 4 7 10 7 4 1]; and the plot it by : figure,plot(a,b), how can I draw let's say a red line vertical to the value 3 and 5 in the x-axis? So that i can see the window between 3 and 5.
Thanks so much in advance, Mehdi

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Walter Roberson
Walter Roberson 2011-11-2
yL = get(gca,'YLim');
line([3 3],yL,'Color','r');
line([5 5],yL,'Color','r');

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