sin function gives straight line when plotting

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Akasha Sage
Akasha Sage 2019-2-27
回答： Star Strider 2019-2-27
when plotting
x = [0 50];
y1 = 0.25*x.*sin(x);
y2 = 0.25*x;
y3 = -0.25*x;
plot(x,y1,x,y2,'--',x,y3,'--')
i get a straight line for y1, it should be oscillating between y2 and y3. what am i doing wrong?

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回答（1 个）

Star Strider
Star Strider 2019-2-27
You are only plotting two points, at x=0 and x=50.
Try this instead:
x = linspace(0, 50);
y1 = 0.25*x.*sin(x);
y2 = 0.25*x;
y3 = -0.25*x;
plot(x,y1,x,y2,'--',x,y3,'--')

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