Re: diff(x) question

[Joao Cardoso]

El Jeffo wrote:
> 
> Gosh, the subscribe to this list was faster than I thought :)
> Perhaps you folks can help me out.
> 
> Say I have the following:
> 
> t=[1:.1:10]
> x=sin(t)
> and I want to plot the derivative of sin(t) (but I want to compute it)
> 
> I tried
> y=diff(x)
> 
> and then plot(t,x,t,y) yields me an error message that states the
> the vector sizes must be the same.. so I did
> plot(t,x,[1.1:.1:10],y)
> 
> and it worked, but the y is really small and never goes beyond .1 in
> value.  Do you think you could point me in the right direction?
> I guess I'm differentiating wrong, how should this really be done?

Try the enclose `diffn'

Joao
> 
> Thanks :)
> 
> Jeff
 
-- 
Joao Cardoso                |   e-mail: address@hidden
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