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Re: Derivative [message #60987 is a reply to message #55080]

Tue, 01 July 2008 12:05

Vince Hradil
Messages: 574
Registered: December 1999

Senior Member

On Jul 1, 1:58 pm, w...@bao.ac.cn wrote:
> I have a 2-D array (a image) A. I want to know its partial
> derivatives along X direction and Y direction.
> dA(x,y)/dx=B
> dA(x,y)/dy=C
> B and C should also be 2-D array.
> I want to know if IDL has some function or operator can do this job
> directly.
> If it has not those I wanted, then I must write some program according
> to "Spline and Lagrange".
> I am not a foolish boy. But I am a lazy boy.
> Who can tell me if IDL can do this job for me?
> Thanks!

have you tried deriv()? Have you tried:
IDL> ?

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[Message index]

		Derivative along one dimension of a data cube? By: Ryan[1] on Sat, 28 July 2007 09:30
		Re: Derivative By: Vince Hradil on Tue, 01 July 2008 12:36
		Re: Derivative By: wxf on Tue, 01 July 2008 12:11
		Re: Derivative By: Vince Hradil on Tue, 01 July 2008 12:05

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