Need help making a stairs graph

2014 3 22
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更新时间：2014 3 22
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Hi can anyone tell me how to make a stair graph? For example, I have two y values, the fist is 3 when x is from 0 to 4, the second is -3 when x is from 4 to 8.
Since the total length is 8, I put
x=8;
y=??;
but what do I need to put for y? when there are two difference values but I need them on the same graph.
stairs(x,y)
Best Regards
Samious

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Image Analyst
Image Analyst 2014-3-22

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Try this:
x = 0 : 8
y = [3,3,3,3, -3,-3,-3,-3,-3];
stairs(x, y, 'bo-', 'LineWidth', 3);
ylim([-4, 4]);
grid on;

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Samious
Samious 2014-3-22
编辑：Samious 2014-3-22
just a quick question though, if x is an unknown number, eg (b), what do I need to put in y? (point a is in the middle)
3, between 0 and a, -3 between a and b
will this work?
x=0:b y=[3*(b-a),-3*(a+(b-a))]?
Image Analyst
Image Analyst 2014-3-22
Here's some more general code to handle that:
amplitude = 4.3;
b = 8;
a = 3;
x = [0 : a, a : b]
y = [amplitude * ones(1, a+1), -amplitude * ones(1, length(a:b))]
stairs(x, y, 'bo-', 'LineWidth', 3);
ylim([-5, 5]);
grid on;

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