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Re: Differentiation in IDL [message #50645 is a reply to message #50644]

Mon, 16 October 2006 07:15

Braedley
Messages: 57
Registered: September 2006

Member

Also, d/dx(f(g(x)))=f'(g(x))*g'(x) (chain rule), so in your case,
d/dx(sin(x*!dtor))=cos(x*!dtor)*!dtor
If you divide the result from DERIV by !dtor, you'll get the result
you're looking for. My suggestion would be to declare x as
x=findgen(360)*!dtor
to begin with.

Cheers

David Fanning wrote:
> David Fanning writes:
>
>> Wox writes:
>>
>>> Specify x?
>>>
>>> dx = DERIV(x * !dtor,data)
>>
>> Oh, sorry.
>>
>> x = findgen(360)
>>
>> David
>>
>
> Oh, sorry. I misunderstood. Yes, this does it. Thank you!
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Differentiation in IDL By: David Fanning on Mon, 16 October 2006 07:31
		Re: Differentiation in IDL By: Allan Whiteford on Mon, 16 October 2006 07:26
		Re: Differentiation in IDL By: Braedley on Mon, 16 October 2006 07:15
		Re: Differentiation in IDL By: David Fanning on Mon, 16 October 2006 06:59
		Re: Differentiation in IDL By: David Fanning on Mon, 16 October 2006 06:56
		Re: Differentiation in IDL By: Wox on Mon, 16 October 2006 06:54

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