Plotting differential equations, need help

2014 10 6
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更新时间：2014 10 6
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y = diff(sin(2*pi*t))./diff(t);
plot(t,y)
Remember diff() shortens the length of your vector by one so you will need to define a new time vector to plot against. ---- how do i do this?
thank you

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Yu Jiang
Yu Jiang 2014-10-6

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plot(t(2:end),y)

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Andrew
Andrew 2014-10-6
yeah works for sin(), however when you try to do it for t^2. come sup with error.
Geoff Hayes
Geoff Hayes 2014-10-6
What is the error, and the line(s) of code that you are using?
Andrew
Andrew 2014-10-6
using your fix for the plot(t(2:end),y), as plot(t,y) doesn't work
Error using diff
Difference order N must be a positive integer scalar.
Andrew
Andrew 2014-10-6
y=diff(t,t);
plot(y,t)
returning an error
Yu Jiang
Yu Jiang 2014-10-6
编辑：Yu Jiang 2014-10-6
what is the t vector? What is the expected result from y=diff(t,t)?? This is different from you original post.
I tried the following on my machine, and it worked
t = linspace(-10,10,100);
y = diff(sin(2*pi*t))./diff(t);
plot(t(2:end),y)
Andrew
Andrew 2014-10-6
yeah it works, but when u integrate that technique into a different equation, it triggers an error.
Andrew
Andrew 2014-10-6
its ok, i fixed it. thanks for your help sir.

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