I have a question about plot. Plesase help me.

2013 12 20
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I want to draw a line x = a perpendicular to the x axis in matlab. How do I do ? (with a = constant) value y from 3 to 5.

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Geert
Geert 2013-12-20
编辑：Geert 2013-12-20

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% define your constant:
a = 5;
% define y limits
ymin = -10;
ymax = 10;
% define x and y values
x = a*ones(2,1);
y = linspace(ymin,ymax,length(x));
% plot the result
figure()
plot(x,y,'r-')
xlabel('x')
ylabel('y')
title('plot of x = a')

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