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Re: A problem using IDL? [message #60100 is a reply to message #60099]

Thu, 01 May 2008 07:49

pgrigis
Messages: 436
Registered: September 2007

Senior Member

If you want a meaningful plot of a sinusoidal function,
you should make sure that you have enough data
points (say, at least 10) in each cycle (period) of the function.
If this condition is not fulfilled, the plot will look strange.

Cheers,
Paolo

chih...@sohu.com wrote:
> I used idl to write the following:
>
> window,xsize=800,ysize=400
> min=0
> max=100
> n=200
> x=fltarr(n+1)
> for i=0,n do x[i]=min+double(i)*(max-min)/n
> print,x
> y=sin(2*3.141593*x)
> plot,x,y
>
> When n=100 or n=200,the graph is wrong. When n >=300,it's OK.Can
> someone tell me why?

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[Message index]

		Re: A problem using IDL? By: R.G. Stockwell on Fri, 02 May 2008 09:20
		Re: A problem using IDL? By: R.G. Stockwell on Fri, 02 May 2008 09:16
		Re: A problem using IDL? By: Vince Hradil on Thu, 01 May 2008 08:41
		Re: A problem using IDL? By: pgrigis on Thu, 01 May 2008 07:49

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